## 2018 GMAT Quant Official Guide – Detailed Analysis / Question Categorization

GMAT Genius has thoroughly analyzed the 2018 GMAT Quant Official Guide and we want to share our insights with you. Feel free to read our detailed analysis of the 2018 GMAT Quant Official Guide or skip down to our conclusions. Wishing you tremendous success with the GMAT!

## Overview of 2018 GMAT Quant Official Guide

The Official Guides for GMAT Review contain retired real GMAT questions, and are an essential component of your GMAT preparations. The GMAC places questions in order of increasing difficulty, based on its assessment of difficulty. The 2018 GMAT Quant Official Guide has no overlap with questions in the main Official Guide.

The 2018 GMAT Quant Official Guide contains 45 new questions out of the 300 total questions, representing 15% new content. These are new questions that we have not encountered before; they are not questions recycled from older GMAC resources.

## Problem Solving

The 2018 GMAT Quant Official Guide contains 176 Problem Solving questions. The GMAC classifies question difficulty into three categories as follows:

Difficulty Number Percent Change
Easy 89 51% +4
Medium 43 24% (9)
Hard 44 25% +5

The Problem Solving section contains 26 new questions, with difficulty of Easy / Medium / Hard as follows: 15 / 5 / 6. This is in lieu of 26 questions from the 2017 edition that have been removed, with difficulty of Easy / Medium / Hard as follows: 11 / 14 / 1. Unlike in prior years, the GMAC has not reclassified the difficulty of any question.

GMAT Genius classifies question difficulty into five categories. Our assessment skews slightly more towards the center, but contains notable differences from the GMAC’s assessment. Our difficulty assessment is only 76.1% correlated with the GMAC’s assessment, demonstrating tremendous subjectivity involved in assessing question difficulty. Here’s our breakdown:

Difficulty Number Percent Change
Super Easy 21 12% (1)
Easy 55 31%
Medium 62 35% (1)
Hard 30 17% +1
Very Hard 8 5% +1

Although math questions often entail multiple math concepts, GMAT Genius classifies questions based on our assessment of the primary math concept. We break down the 176 Problem Solving questions as follows:

Type Concept Number Percent Change
Arithmetic Basic 16 9.1% +2
Arithmetic Absolute Value 3 1.7%
Arithmetic Divisibility/Factors/Mult. 7 4% (3)
Arithmetic Exponents & Roots 8 4.5% (1)
Arithmetic Fractions & Ratios 22 12.5% +1
Arithmetic Percents 12 6.8% (3)
Arithmetic Pos/Neg & Odd/Even 1 0.6% (2)
Algebra Inequalities 4 2.3% +1
Algebra Linear Equations 9 5.1%
Algebra Simultaneous Equations 6 3.4%
Algebra Variables in Answers 5 2.8% +1
Geometry Circles 4 2.3%
Geometry Coordinate 5 2.8%
Geometry Rectangles 5 2.8%
Geometry Triangles 4 2.3%
Geometry Other 4 2.3%
Statistics Averages 14 8% +1
Statistics Other 3 1.7%
Word Problems Combinatorics 4 2.3%
Word Problems Functions & Sequences 12 6.8%
Word Problems Groups/Sets 3 1.7% +1
Word Problems Probability 2 1.1%
Word Problems Revenue/Profit/Interest 5 2.8% +1
Word Problems Rate & Work 8 4.5% (1)

Here’s a list of the 26 new Problem Solving questions:
13, 22, 29, 31, 52, 55, 65, 70, 71, 73, 74, 75, 78, 85, 89, 92, 99, 102, 104, 117, 135, 141, 144, 156, 165, 168

Here’s a list of the 176 Problem Solving questions categorized by primary math concept:

Type Concept Question #s
Arithmetic Basic 2, 5, 21, 44, 45, 67, 75, 77, 85, 88, 89, 92, 94, 100, 162, 170
Arithmetic Absolute Value 95, 105, 150
Arithmetic Divisibility/Factors/Mult. 52, 86, 103, 114, 122, 171, 173
Arithmetic Exponents & Roots 34, 36, 38, 48, 90, 112, 143, 160
Arithmetic Fractions & Ratios 8, 20, 24, 35, 40, 43, 46, 49, 54, 55, 60, 64, 73, 74, 78, 83, 84, 91, 108, 136, 144, 176
Arithmetic Percents 7, 17, 28, 30, 47, 59, 99, 111, 117, 118, 132, 168
Arithmetic Pos/Neg & Odd/Even 14
Algebra Inequalities 4, 29, 101, 163
Algebra Linear Equations 3, 9, 13, 15, 18, 42, 50, 71, 98
Algebra Quadratics 1, 19, 22, 33, 63, 66, 110, 121, 128, 156
Algebra Simultaneous Equations 12, 25, 31, 32, 41, 133
Algebra Variables in Answers 16, 39, 102, 120, 125
Geometry Circles 37, 134, 151, 169
Geometry Coordinate 26, 87, 96, 109, 115
Geometry Rectangles 11, 27, 104, 129, 175
Geometry Triangles 62, 68, 140, 164
Geometry Other 23, 139, 146, 149
Statistics Averages 10, 58, 61, 82, 93, 107, 119, 126, 131, 135, 147, 148, 153, 161
Statistics Other 72, 79, 81
Word Problems Combinatorics 152, 154, 155, 157
Word Problems Functions & Sequences 53, 56, 69, 76, 80, 116, 127, 137, 138, 145, 159, 166
Word Problems Groups/Sets 106, 141, 142
Word Problems Probability 158, 167
Word Problems Revenue/Profit/Interest 6, 65, 124, 165, 172
Word Problems Rate & Work 51, 57, 70, 97, 113, 123, 130, 174

## Data Sufficiency

The 2018 GMAT Quant Official Guide contains 124 Data Sufficiency questions. The GMAC classifies question difficulty into three categories as follows:

Difficulty Number Percent Change
Easy 27 22% +1
Medium 33 27% +2
Hard 64 52% (3)

In the Data Sufficiency section, questions are not fully presented in order of progressive difficulty, contrary to what the back cover of the book claims. Based on difficulty levels provided in the online version, Medium and Hard difficulty questions are interspersed. The following table shows the question numbers for each difficulty level:

Difficulty Question #s
Easy 177-203
Medium 204-235, 239
Hard 236-238, 240-300

The Data Sufficiency section contains 19 new questions, with difficulty of Easy / Medium / Hard as follows: 2 / 6 / 11. This is in lieu of 19 questions from the 2017 edition that have been removed, with difficulty of Easy / Medium / Hard as follows: 1 / 4 / 14. The GMAC has not reclassified the difficulty of any question.

GMAT Genius classifies question difficulty into five categories. Our assessment skews significantly easier, and contains notable differences from the GMAC’s assessment. Our difficulty assessment is only 68.5% correlated with the GMAC’s assessment, demonstrating tremendous subjectivity involved in assessing question difficulty. Here’s our breakdown:

Difficulty Number Percent Change
Super Easy 12 10% +1
Easy 25 20% (3)
Medium 54 44%
Hard 27 22% +2
Very Hard 6 5%

Although many math questions entail multiple math concepts, GMAT Genius classifies questions based on our assessment of the primary math concept. We break down the 124 Data Sufficiency questions as follows:

Type Concept Number Percent Change
Arithmetic Basic 3 2.4% (2)
Arithmetic Absolute Value 1 0.8%
Arithmetic Divisibility/Factors/Mult. 8 6.5% +2
Arithmetic Exponents & Roots 12 9.7% (1)
Arithmetic Fractions & Ratios 8 6.5%
Arithmetic Percents 6 4.8%
Arithmetic Pos/Neg & Odd/Even 5 4%
Arithmetic Primes 3 2.4% +1
Algebra Inequalities 12 9.7% +2
Algebra Linear Equations 3 2.4%
Algebra Simultaneous Equations 9 7.3% (5)
Geometry Circles 6 4.8% +1
Geometry Coordinate 4 3.2%
Geometry Rectangles 3 2.4%
Geometry Triangles 3 2.4%
Geometry Other 2 1.6%
Statistics Averages 6 4.8%
Statistics Other 5 4%
Word Problems Functions & Sequences 7 5.6%
Word Problems Groups/Sets 4 3.2% +1
Word Problems Probability 1 0.8% (1)
Word Problems Revenue/Profit/Interest 2 1.6%
Word Problems Rate & Work 4 3.2%

Here’s a list of the 19 new Data Sufficiency questions:
178, 193, 215, 216, 224, 226, 231, 239, 244, 246, 247, 257, 270, 281, 283, 285, 291, 295, 296

Here’s a list of the 124 Data Sufficiency questions categorized by primary math concept:

Type Concept Question #s
Arithmetic Basic 177, 180, 234
Arithmetic Absolute Value 214
Arithmetic Divisibility/Factors/Mult. 221, 224, 238, 247, 257, 272, 296, 297
Arithmetic Exponents & Roots 184, 210, 226, 240, 251, 254, 267, 268, 271, 282, 285, 300
Arithmetic Fractions & Ratios 182, 190, 201, 204, 233, 243, 255, 295
Arithmetic Percents 193, 199, 208, 222, 253, 266
Arithmetic Pos/Neg & Odd/Even 189, 196, 198, 213, 237
Arithmetic Primes 219, 270, 281
Algebra Inequalities 181, 188, 192, 200, 206, 215, 227, 231, 249, 252, 263, 276
Algebra Linear Equations 195, 218, 250
Algebra Quadratics 232, 239, 259, 265, 273, 279, 283
Algebra Simultaneous Equations 178, 202, 203, 217, 223, 230, 242, 269, 284
Geometry Circles 209, 216, 236, 256, 258, 278
Geometry Coordinate 191, 260, 290, 299
Geometry Rectangles 179, 185, 248
Geometry Triangles 261, 275, 291
Geometry Other 205, 207
Statistics Averages 194, 211, 228, 241, 244, 245
Statistics Other 225, 229, 235, 262, 294
Word Problems Functions & Sequences 197, 220, 264, 277, 280, 286, 287
Word Problems Groups/Sets 246, 274, 288, 293
Word Problems Probability 292
Word Problems Revenue/Profit/Interest 183, 186
Word Problems Rate & Work 187, 212, 289, 298

## Online Interface

The 2018 GMAT Quant Official Guide includes an access code (see inside front cover) that provides 12-month usage of an online version of this Official Guide. The online practice interface is the same as it was previously, except that the onerous limit of 10 saved sessions has been increased to 25 saved sessions in Exam Mode plus 25 saved sessions in Practice Mode (which you should not use, as mentioned below). The 100 questions from the Diagnostic Test chapter of the main Official Guide, but that are not contained in this printed book, are available in a separate tab that works with Exam Mode functionality.

Since the GMAT is a computer-based test, we believe that it is advisable to work though the questions online. We strongly suggest that you use Exam Mode rather than Practice Mode, since we recommend that students practice using timed question sets that replicate test day conditions. The functionality of the online platform is good overall. You can choose practice sets by question type and difficulty level. Every question lists the corresponding book question number for easy cross-referencing.

## Other Notes

The Official Guides are for practicing with real GMAT questions, not for learning the underlying concepts. The book contains a 40-page Math Review section that provides a very high-level overview of the math concepts tested on the GMAT. This math review will be highly inadequate except perhaps for the most advanced math students. We recommend that you use additional study materials to learn the math concepts.

Although all questions include answer explanations, many GMAT test takers are far from satisfied with these explanations. The explanations can be brief and hard-to-understand for non-advanced students. Furthermore, certain explanations are convoluted and overlook more efficient approaches.

## Conclusions

The 2018 GMAT Quant Official Guide has three primary weaknesses, in our opinion:

1. An insufficient amount of difficult practice questions, particularly based on GMAT Genius’ assessment of difficulty.
2. Math answer explanations that are too often either brief or convoluted.
3. In the Data Sufficiency section, questions are not fully presented in order of progressive difficulty, contrary to what the back cover of the book claims.

Despite these flaws, the 2018 GMAT Quant Official Guide is an essential source of GMAT practice. We believe that every GMAT aspirant must use this book (or the prior edition). For the best value, we recommend purchasing this book as part of the 2018 GMAT Official Guide Bundle. If you already have the 2017 edition of this book, however, the replacement of 45 questions is not sufficient to make this edition worth purchasing.

## 2018 GMAT Official Guide – Detailed Analysis / Question Categorization

GMAT Genius has thoroughly analyzed the 2018 GMAT Official Guide and we want to share our insights with you. Feel free to read our detailed analysis of the 2018 GMAT Official Guide or skip down to our conclusions. Wishing you tremendous success with the GMAT!

## Overview of 2018 GMAT Official Guide

The Official Guides for GMAT Review contain retired real GMAT questions, and are an essential component of your GMAT preparations. The GMAC places questions in order of increasing difficulty, based on its assessment of difficulty. This book has no overlap in practice questions with the Quant and Verbal Official Guides.

The 2018 GMAT Official Guide contains 130 new questions out of the 957 total questions (including Integrated Reasoning). Excluding the 100 questions in the Diagnostic Exam section of the book, the new questions represent just over 15% new content. These are new questions that we have not encountered before; they are not questions recycled from older GMAC resources.

## Problem Solving

The 2018 GMAT Official Guide contains 254 Problem Solving questions, including the 24 Problem Solving questions in the Diagnostic Exam portion of the book. The GMAC classifies question difficulty into three categories as follows:

Difficulty Number Percent Change
Easy 96 38% +14
Medium 59 23% +4
Hard 99 39% (18)

The Problem Solving section contains 35 new questions, with difficulty of Easy / Medium / Hard as follows: 22 / 7 / 6. This is in lieu of 35 questions from the 2017 edition that have been removed, with difficulty of Easy / Medium / Hard as follows: 8 / 3 / 24. Unlike in prior years, the GMAC has not reclassified the difficulty of any question.

GMAT Genius classifies question difficulty into five categories. Our assessment of this section skews significantly easier, and contains notable differences from the GMAC’s assessment. Our difficulty assessment is only 69.9% correlated with the GMAC’s assessment, demonstrating tremendous subjectivity involved in assessing question difficulty. Here’s our breakdown:

Difficulty Number Percent Change
Super Easy 23 9% +3
Easy 70 28% +2
Medium 104 41% (5)
Hard 38 15% (2)
Very Hard 19 7% +2

Although math questions often entail multiple math concepts, GMAT Genius classifies questions based on our assessment of the primary math concept. We break down the 254 Problem Solving questions as follows:

Type Concept Number Percent Change
Arithmetic Basic 10 3.9% +3
Arithmetic Absolute Value 4 1.6%
Arithmetic Divisibility/Factors/Mult. 17 6.7% +2
Arithmetic Exponents & Roots 18 7.1% (4)
Arithmetic Fractions & Ratios 28 11% (2)
Arithmetic Percents 20 7.9%
Arithmetic Pos/Neg & Odd/Even 1 0.4%
Arithmetic Primes 4 1.6%
Algebra Inequalities 5 2%
Algebra Linear Equations 14 5.5% +1
Algebra Simultaneous Equations 7 2.8%
Algebra Variables in Answers 8 3.1% +1
Geometry Circles 4 1.6% (1)
Geometry Coordinate 7 2.8% (1)
Geometry Rectangles 7 2.8%
Geometry Triangles 8 3.1% +2
Geometry Other 7 2.8%
Statistics Averages 18 7.1% (1)
Statistics Other 7 2.8% +1
Word Problems Combinatorics 7 2.8%
Word Problems Functions & Sequences 10 3.9% (1)
Word Problems Groups/Sets 7 2.8%
Word Problems Probability 7 2.8% (1)
Word Problems Revenue/Profit/Interest 9 3.5% +1
Word Problems Rate & Work 12 4.7%

Here’s a list of the 35 new Problem Solving questions:
3, 5, 6, 16, 22, 23, 24, 26, 33, 34, 40, 42, 50, 53, 55, 60, 68, 69, 72, 79, 81, 85, 90, 96, 98, 104, 122, 125, 139, 140, 151, 173, 201, 224, 229

Here’s a list of the 230 Problem Solving questions, excluding those in the Diagnostic Exam, categorized by primary math concept:

Type Concept Question #s
Arithmetic Basic 2, 19, 22, 37, 46, 79, 157, 173, 219
Arithmetic Absolute Value 25, 27, 65, 193
Arithmetic Divisibility/Factors/Mult. 33, 44, 54, 73, 81, 98, 121, 126, 136, 141, 154, 175, 176, 178, 195
Arithmetic Exponents & Roots 66, 68, 71, 74, 90, 92, 112, 147, 161, 180, 200, 209, 213, 216, 223, 230
Arithmetic Fractions & Ratios 3, 4, 5, 28, 30, 36, 45, 59, 63, 72, 75, 82, 91, 97, 103, 124, 131, 133, 135, 139, 160, 163, 189, 192, 203, 220, 222
Arithmetic Percents 1, 6, 10, 15, 55, 70, 80, 86, 87, 89, 94, 106, 108, 119, 122, 125, 153, 169, 172, 207
Arithmetic Pos/Neg & Odd/Even 62
Arithmetic Primes 181, 205
Algebra Inequalities 49, 78, 117, 185, 228
Algebra Linear Equations 7, 12, 31, 42, 53, 67, 83, 85, 109, 111, 128, 134, 179, 184
Algebra Quadratics 51, 93, 110, 127, 155, 168, 188, 226
Algebra Simultaneous Equations 13, 20, 35, 100, 150, 186
Algebra Variables in Answers 9, 16, 48, 57, 61, 144, 167, 190
Geometry Circles 95, 123, 146, 177
Geometry Coordinate 50, 56, 77, 101, 107, 183, 218
Geometry Rectangles 17, 18, 39, 58, 99, 156, 202
Geometry Triangles 26, 29, 43, 145, 174, 224
Geometry Other 32, 34, 114, 159
Statistics Averages 14, 21, 40, 41, 96, 116, 137, 138, 149, 158, 164, 171, 194, 211, 217, 227
Statistics Other 52, 84, 115, 151, 166, 197, 204
Word Problems Combinatorics 140, 148, 182, 187, 201, 214
Word Problems Functions & Sequences 47, 88, 104, 165, 196, 198, 206, 212, 225
Word Problems Groups/Sets 118, 120, 152, 208, 229
Word Problems Probability 11, 142, 162, 170, 221
Word Problems Revenue/Profit/Interest 24, 38, 60, 130, 143, 191, 210, 215
Word Problems Rate & Work 8, 23, 64, 69, 76, 102, 105, 113, 129, 132, 199

## Data Sufficiency

The 2018 GMAT Official Guide contains 198 Data Sufficiency questions, including the 24 Data Sufficiency questions in the Diagnostic Exam portion of the book. The GMAC classifies question difficulty into three categories as follows:

Difficulty Number Percent Change
Easy 58 29% +8
Medium 57 29% +6
Hard 83 42% (14)

The Data Sufficiency section contains 26 new questions, with difficulty of Easy / Medium / Hard as follows: 11 / 10 / 5. This is in lieu of 26 questions from the 2017 edition that have been removed, with difficulty of Easy / Medium / Hard as follows: 3 / 4 / 19. The GMAC has not reclassified the difficulty of any question.

GMAT Genius classifies question difficulty into five categories. Our assessment skews significantly easier, and contains notable differences from the GMAC’s assessment. Our difficulty assessment is only 56.0% correlated with the GMAC’s assessment, demonstrating tremendous subjectivity involved in assessing question difficulty. Here’s our breakdown:

Difficulty Number Percent Change
Super Easy 9 5% +2
Easy 58 29% +8
Medium 90 45% (2)
Hard 35 18% (6)
Very Hard 6 3% (2)

Although many math questions entail multiple math concepts, GMAT Genius classifies questions based on our assessment of the primary math concept. We break down the 198 Data Sufficiency questions as follows:

Type Concept Number Percent Change
Arithmetic Basic 17 8.6% +7
Arithmetic Divisibility/Factors/Mult. 9 4.5% +1
Arithmetic Exponents & Roots 14 7.1%
Arithmetic Fractions & Ratios 11 5.6% (2)
Arithmetic Percents 15 7.6% (1)
Arithmetic Pos/Neg & Odd/Even 8 4% (1)
Arithmetic Primes 1 0.5%
Algebra Inequalities 14 7.1% +4
Algebra Linear Equations 11 5.6% +1
Algebra Simultaneous Equations 9 4.5% (1)
Geometry Circles 5 2.5%
Geometry Coordinate 7 3.5%
Geometry Rectangles 4 2%
Geometry Triangles 10 5.1%
Geometry Other 5 2.5% (1)
Statistics Averages 14 7.1%
Statistics Other 10 5.1% (1)
Word Problems Functions & Sequences 4 2% (1)
Word Problems Groups/Sets 11 5.6%
Word Problems Probability 3 1.5%
Word Problems Revenue/Profit/Interest 6 3% (2)
Word Problems Rate & Work 7 3.5% (2)

Here’s a list of the 26 new Data Sufficiency questions:
233, 258, 260, 262, 266, 267, 273, 274, 276, 277, 278, 282, 284, 287, 288, 292, 293, 300, 306, 313, 326, 334, 339, 376, 382, 391

Here’s a list of the 174 Data Sufficiency questions, excluding those in the Diagnostic Exam, categorized by primary math concept:

Type Concept Question #s
Arithmetic Basic 258, 262, 270, 273, 283, 284, 288, 292, 309, 326, 329, 333, 334, 349, 372, 388, 403
Arithmetic Divisibility/Factors/Mult. 285, 293, 328, 337, 356, 390
Arithmetic Exponents & Roots 240, 243, 249, 281, 289, 330, 342, 350, 365, 370, 399
Arithmetic Fractions & Ratios 233, 256, 275, 312, 325, 335, 354, 368, 387, 402, 404
Arithmetic Percents 239, 253, 259, 269, 286, 313, 318, 319, 321, 324, 332, 340, 362, 397
Arithmetic Pos/Neg & Odd/Even 255, 271, 277, 278, 308, 314, 344
Arithmetic Primes 357
Algebra Inequalities 246, 274, 291, 306, 315, 320, 338, 355, 359, 361, 376, 391, 401
Algebra Linear Equations 234, 247, 252, 280, 290, 310, 339, 351, 352
Algebra Simultaneous Equations 232, 245, 303, 307, 322, 327, 345, 360
Geometry Circles 263, 287, 369, 379
Geometry Coordinate 235, 264, 331, 347, 382, 383
Geometry Rectangles 301, 311, 367
Geometry Triangles 231, 237, 260, 265, 346, 353, 384, 386, 398
Geometry Other 261, 304, 343, 371, 400
Statistics Averages 282, 295, 300, 348, 358, 363, 373, 375, 378, 381, 392, 396
Statistics Other 242, 244, 298, 317, 336, 385, 394, 395
Word Problems Functions & Sequences 241, 257, 364, 377
Word Problems Groups/Sets 248, 254, 266, 267, 276, 294, 305, 316, 389
Word Problems Probability 236, 297, 302
Word Problems Revenue/Profit/Interest 250, 268, 272, 296, 393
Word Problems Rate & Work 238, 251, 299, 341, 374, 380

## Sentence Correction

The 2018 GMAT Official Guide contains 158 Sentence Correction questions, including the 18 Sentence Correction questions in the Diagnostic Exam portion of the book. The GMAC classifies question difficulty into three categories as follows:

Difficulty Number Percent Change
Easy 36 23% +1
Medium 49 31% (1)
Hard 73 46%

The Sentence Correction section contains 21 new questions, with difficulty of Easy / Medium / Hard as follows: 4 / 4 / 13. This is in lieu of 21 questions from the 2017 edition that have been removed, with difficulty of Easy / Medium / Hard as follows: 3 / 5 / 13. The GMAC has not reclassified the difficulty of any question.

GMAT Genius classifies question difficulty into five categories. Our assessment skews noticeably easier, and contains notable differences from the GMAC. Our difficulty assessment is only 56.8% correlated with the GMAC’s assessment, clearly showing that there is subjectivity involved in assessing question difficulty. Here’s our breakdown:

Difficulty Number Percent Change
Super Easy 3 2%
Easy 43 27% (1)
Medium 67 42% (3)
Hard 38 24% +4
Very Hard 7 4%

Although Sentence Correction questions typically entail multiple grammar concepts (as described on our website), GMAT Genius classifies questions based on our assessment of the primary tested concept. We classify the 158 Sentence Correction questions as follows:

Concept Number Percent Change
Verb Agreement 19 12% +1
Verb Tense 22 13.9%
Pronoun Ambiguity 12 7.6% +2
Pronoun Agreement 4 2.5%
Parallel Construction 50 31.6% (2)
Misplaced Modifiers 16 10.1% (1)
Idioms 8 5.1% +1
Comparison & Quantity 10 6.3% (1)
Expression & Meaning 17 10.8%

Here’s a list of the 21 new Sentence Correction questions:
674, 680, 684, 685, 699, 702, 717, 735, 743, 745, 750, 751, 763, 770, 777, 780, 781, 782, 784, 796, 799

Here’s a list of the 140 Sentence Correction questions, excluding those in the Diagnostic Exam, categorized by primary grammar concept:

Concept Question #s
Verb Agreement 670, 677, 685, 693, 707, 711, 721, 752, 753, 759, 771, 789, 792, 793, 799, 801, 807
Verb Tense 668, 686, 694, 701, 702, 708, 712, 722, 724, 731, 735, 740, 749, 754, 756, 764, 773, 781, 803, 804
Pronoun Ambiguity 671, 719, 743, 774, 775, 777, 778, 779
Pronoun Agreement 688, 738, 762, 765
Parallel Construction 669, 679, 680, 682, 687, 689, 692, 697, 699, 703, 710, 713, 714, 715, 725, 727, 728, 730, 732, 734, 736, 737, 741, 742, 744, 751, 755, 757, 760, 761, 763, 766, 767, 776, 780, 782, 783, 784, 794, 800, 802, 806
Misplaced Modifiers 683, 705, 706, 709, 716, 718, 723, 729, 739, 746, 748, 770, 790, 797, 798
Idioms 672, 695, 698, 717, 788, 795, 796
Comparison & Quantity 676, 678, 691, 704, 745, 758, 769, 772, 791, 805
Expression & Meaning 673, 674, 675, 681, 684, 690, 696, 700, 720, 726, 733, 747, 750, 768, 785, 786, 787

## Critical Reasoning

The 2018 GMAT Official Guide contains 141 Critical Reasoning questions, including the 17 Critical Reasoning questions in the Diagnostic Exam portion of the book. The GMAC classifies question difficulty into three categories as follows:

Difficulty Number Percent Change
Easy 41 29%
Medium 44 31% (1)
Hard 56 40% +1

The Critical Reasoning section contains 19 new questions, with difficulty of Easy / Medium / Hard as follows: 6 / 2 / 11. This is in lieu of 19 questions from the 2017 edition that have been removed, with difficulty of Easy / Medium / Hard as follows: 6 / 3 / 10. The GMAC has not reclassified the difficulty of any question.

GMAT Genius classifies question difficulty into five categories. Our assessment skews slightly easier, but contains notable differences from the GMAC. Our difficulty assessment is 74.1% correlated with the GMAC’s assessment, clearly indicating subjectivity involved in assessing question difficulty. Here’s our breakdown:

Difficulty Number Percent Change
Super Easy 0 0%
Easy 43 30% (2)
Medium 49 35% (1)
Hard 36 26% +3
Very Hard 13 9%

We have grouped the questions based on the question type categorization that GMAT Genius uses for Critical Reasoning (as described on our website). We break down the 141 Critical Reasoning questions as follows:

Concept Number Percent Change
Weaken 29 20.6% +2
Strengthen 27 19.1% (2)
Assumption 15 10.6% +1
Reasoning 4 2.8% (1)
Conclusion 9 6.4%
Explain 18 12.8% +1
Evaluate 15 10.6% (1)
Boldface 9 6.4%
Complete the Passage 15 10.6%

Here’s a list of the 19 new Critical Reasoning questions:
546, 550, 554, 556, 561, 575, 589, 599, 626, 627, 631, 634, 635, 640, 643, 651, 656, 660, 661

Here’s a list of the 124 Critical Reasoning questions, excluding those in the Diagnostic Exam, categorized by CR question type:

Concept Question #s
Weaken 546, 549, 574, 575, 583, 588, 600, 606, 615, 617, 619, 620, 622, 625, 627, 629, 642, 646, 654, 658, 664, 666, 667
Strengthen 545, 547, 548, 552, 562, 566, 569, 570, 572, 576, 589, 592, 594, 595, 597, 598, 602, 604, 610, 611, 624, 631, 641, 648, 649
Assumption 555, 580, 584, 590, 607, 608, 614, 628, 635, 637, 645, 650, 655, 657
Reasoning 560, 567, 578, 633
Conclusion 544, 581, 591, 618, 634, 653, 662
Explain 551, 553, 556, 557, 558, 568, 586, 596, 613, 616, 621, 630, 640, 656, 660, 665
Evaluate 554, 559, 571, 573, 579, 585, 632, 636, 638, 643, 644, 663
Boldface 561, 565, 599, 623, 639, 647, 651, 652, 659
Complete the Passage 550, 563, 564, 577, 582, 587, 593, 601, 603, 605, 609, 612, 626, 661

The 2018 GMAT Official Guide contains 156 Reading Comprehension questions across 33 passages, including the 17 Reading Comprehension questions in 3 passages in the Diagnostic Exam portion of the book. The GMAC classifies question difficulty into three categories as follows:

Difficulty Number Percent Change
Easy 55 35% +4
Medium 74 47% +1
Hard 27 17% (5)

In the Reading Comprehension section, questions are not fully presented in order of progressive difficulty, contrary to what the back cover of the book claims. Based on difficulty levels provided in the online version, Easy, Medium, and Hard difficulty questions are interspersed. The following table shows the question numbers for each difficulty level:

Difficulty Question #s
Easy 405-438, 442-455
Medium 439-441, 456-516, 537-540
Hard 517-536, 541-543

The Reading Comprehension section contains 21 new questions in 6 passages, with difficulty of Easy / Medium / Hard as follows: 7 / 14 / 0. This is in lieu of 21 questions in 4 passages from the 2017 edition that have been removed, with difficulty of Easy / Medium / Hard as follows: 3 / 13 / 5. The GMAC has not reclassified the difficulty of any question.

GMAT Genius classifies question difficulty into five categories. Whereas the GMAC assigns the same difficulty to all questions for a given passage (except in the Diagnostic Exam section), GMAT Genius assesses the difficulty of each question individually. Our assessment skews slightly harder, but contains notable differences from the GMAC. Our difficulty assessment is only 57.6% correlated with the GMAC’s assessment, in large part due to different difficulty assessment methodologies. Here’s our breakdown:

Difficulty Number Percent Change
Super Easy 7 4% +1
Easy 33 21%
Medium 65 42% (2)
Hard 41 26% +1
Very Hard 10 6%

We have grouped the questions based on the question type categorization that GMAT Genius uses for Reading Comprehension (as described on our website). We break down the 156 Reading Comprehension questions as follows:

Concept Number Percent Change
Primary Purpose 22 14.1% (2)
Author’s Tone 10 6.4%
Organization 5 3.2% +1
Function 20 12.8% +2
Specific Reference 38 24.4%
Inference 47 30.1% (3)
Critical Reasoning 14 9% +2

Here’s a list of the 21 new Reading Comprehension questions: 412 to 418, 439 to 441, 467 to 470, 514 to 516, 537 to 540

We have not provided a list of Reading Comprehension questions by category because it makes sense to practice on one passage at a time, rather than attempting all the Primary Purpose questions (for example) at one go.

## Integrated Reasoning

The 2018 GMAT Official Guide includes online access to 58 Integrated Reasoning practice questions. The IR set includes 8 new questions that we have not seen before, plus all 50 questions from the prior 2017 edition. The 58 questions consist of the following four types:
Multi-Source Reasoning – 21 (3 new)
Table Analysis – 7 (1 new)
Graphics Interpretation – 12 (2 new)
Two-Part Analysis – 18 (2 new)

The GMAC classifies question difficulty into three categories of Easy / Medium / Hard as follows:
Multi-Source Reasoning – 6 / 7 / 8
Table Analysis – 3 / 1 / 3
Graphics Interpretation – 4 / 3 / 5
Two-Part Analysis – 5 / 7 / 6
Total – 18 / 18 / 22

Out of the 50 questions that carry over from the 2017 edition, the GMAC has reclassified the difficulty of 33 questions. For IR, GMAT Genius classifies question difficulty into the same three categories. Except for Two-Part Analysis, our assessment skews significantly easier, and contains notable differences from the GMAC. Our difficulty assessment is only 8.1% correlated with the GMAC’s assessment, clearly showing that there is tremendous subjectivity involved in assessing question difficulty. Here’s our breakdown of Easy / Medium / Hard:
Multi-Source Reasoning – 9 / 11 / 1
Table Analysis – 3 / 4 / 0
Graphics Interpretation – 3 / 7 / 2
Two-Part Analysis – 2 / 10 / 6
Total – 17 / 32 / 9

## Online Interface

The 2018 GMAT Official Guide includes an access code (see inside front cover) that provides 12-month usage of an online version of this Official Guide. The online practice interface is the same as it was previously, except that the onerous limit of 10 saved sessions has been increased to 25 saved sessions in Exam Mode plus 25 saved sessions in Practice Mode (which you should not use, as mentioned below). The 100 questions from the Diagnostic Test chapter are available in a separate tab that works with Exam Mode functionality.

Since the GMAT is a computer-based test, we believe that it is advisable to work though the questions online. We strongly suggest that you use Exam Mode rather than Practice Mode, since we recommend that students practice using timed question sets that replicate test day conditions. The functionality of the online platform is good overall. You can choose practice sets by question type and difficulty level. Every question lists the corresponding book question number for easy cross-referencing.

## Other Notes

The Official Guides are for practicing with real GMAT questions, not for learning the underlying concepts. The book contains a 40-page Math Review section that provides a very high-level overview of the math concepts tested on the GMAT. This math review will be highly inadequate except perhaps for the most advanced math students. Similarly, the brief introductions to the concepts tested on the verbal section are highly inadequate. We recommend that you use additional study materials to learn the math and verbal concepts.

Although all questions include answer explanations, many GMAT test takers are far from satisfied with these explanations. Math explanations can be brief and hard-to-understand for non-advanced students, and are sometimes convoluted or inefficient. Most GMAT test takers consider the Sentence Correction explanations quite cryptic. The Critical Reasoning and Reading Comprehension explanations, however, are reasonably good overall.

## Conclusions

The 2018 GMAT Official Guide has three primary weaknesses, in our opinion:

1. An insufficient amount of difficult practice questions, particularly based on GMAT Genius’ assessment of difficulty. We are especially dismayed to see the net loss of 32 Hard-difficulty Quant questions (18 Problem Solving and 14 Data Sufficiency) based on GMAC’s difficulty assessment compared to the 2017 edition.
2. Math answer explanations that are too often either brief or convoluted and Sentence Correction explanations that are too cryptic.
3. In the Reading Comprehension section, questions are not fully presented in order of progressive difficulty, contrary to what the back cover of the book claims.

Despite these flaws, the 2018 GMAT Official Guide is an essential source of GMAT practice. We believe that every GMAT aspirant must use this book (or the prior edition). For the best value, we recommend purchasing this book as part of 2018 GMAT Official Guide Bundle. If you already have the 2017 edition of this book, however, the replacement of 61 math questions and 61 verbal questions is not sufficient to make this edition worth purchasing.

## Select Section Order on the GMAT

The GMAC announced today a new Select Section Order feature for the GMAT. Beginning July 11, 2017, test takers worldwide can select the order of the sections on their GMAT administrations. The GMAC claims that this will not affect the statistical validity of GMAT scores, but we believe that many GMAT takers will benefit substantially because of this change.

We often find that students score 20 to 30 points higher when they skip the AWA and IR sections on practice exams. We expect many students to achieve similar results by relegating IR and AWA to the end. Score reports will not indicate which section order you selected.

## How Select Section Order Works

You will see the Select Section Order screen during your exam at the Pearson VUE test center on the computer immediately prior to the start of your exam, after choosing the schools for score reports and the navigation tutorial. You have two minutes to make a selection. If you do not pick an option in this timeframe, the original order will be chosen be default. You will have the opportunity to select from one of three possible section orders:

1. AWA, IR, Quant, Verbal (original order)
2. Verbal, Quant, IR, AWA
3. Quant, Verbal, IR, AWA

No matter which order you select, you still get two 8-minute breaks. Each break will be between two of the three parts of the exam: Quant, Verbal, and AWA/IR (combined). Breaks remain optional, but we highly recommend that you take the breaks. Just be sure that you are checked-in and back in your seat before a break ends, or the test will resume without you and you lose valuable time.

## What Order to Choose

We highly recommend selecting option 2 (Verbal, Quant, IR, AWA) or option 3 (Quant, Verbal, IR, AWA). Since it is by far the easiest section of the GMAT, save AWA for last, at which point mental fatigue is likely to set in.

Start with either Quant or Verbal, depending on which section mental fatigue is most likely to be a factor for you. Start with the section on which you are most likely to make careless errors. This will typically, but not necessarily, be the section you are weaker on. By tackling this section first while you are still fresh, the number of careless mistakes is likely to decline.

Some test takers claim that the original order will work best, because they need a warm-up period. We believe, however, that one hour spent on AWA and Integrated Reasoning hardly qualifies as a “warm-up” period. Why expend valuable energy and focus for one hour on the two sections of the exam that do not count towards your overall 200 to 800 score? If you really want a “warm up” period, before entering the test center, practice with a very small handful of Official Guide questions that you have previously done. Just be sure not to bring any practice materials into the test center.

## Updated Test Materials

The official GMATPrep diagnostic test software and the Exam Pack 1 and 2 add-ons will be updated by July 31 to reflect the Select Section Order feature. When the software is updated, you can receive a free upgrade of GMATPrep and the Exam Packs.

The GMAC is working on shifting GMATPrep to a web-based interface from its current software-download format. We’re not sure whether this much-needed update will occur by the July 31 date given by the GMAC.

## Other GMAT Changes

Effective July 11, the GMAC will also eliminate the profile update screens during the GMAT. These are largely unnecessary, since you can update your profile anytime at MBA.com. Removing these screens from the test experience will reduce the overall time you must spend at the test center.

## Why Was Select Section Order Implemented

Ashok Sarathy, GMAC’s VP of Product Management

The GMAC ran a pilot program for Select Section Order in February-March 2016. The pilot program allowed the GMAC to collect valuable data from real test takers, including several GMAT Genius clients, in order to evaluate this feature. The GMAC concluded that GMAT takers appreciated the flexibility in choosing section order and that select section order did not affect the statistical validity of GMAT scores.

“The idea of being allowed to choose the section order had been commonly requested by test takers,” noted Ashok Sarathy, the Vice President of Product Management for the GMAC. “We conducted a pilot in 2016 to test this feature and received overwhelmingly positive feedback, with 85 percent of participants surveyed expressing that this new feature boosted their confidence prior to even taking the exam. Our pilot findings also concluded that taking the exam in different section orders continues to maintain the quality and integrity of the GMAT scores.”

Over the past several years, the GMAC has implemented several changes to enhance test takers’ GMAT experience. This is partly driven by increased competition from the GRE. GMAT changes over the past three years include:

• allowing GMAT takers to cancel scores online within three days after the GMAT and to reinstate cancelled scores for five years (March 2016)
• removing cancelled scores from school score reports and shortening the GMAT retake window to 16 days (July 2015)
• introducing the GMAT Enhanced Score Report to provide test takers a more detailed analysis of their overall GMAT performance (January 2015)
• showing test takers their unofficial GMAT scores before having to decide whether to report or cancel their scores (July 2014)

You can read more about the new Select Section Order feature of the GMAT on the official MBA.com website.

## Preview of 2017 GMAT Official Guide Verbal

GMAT Genius has been working closely with the publisher of the Official Guides for GMAT Review over the past few weeks, in advance of tomorrow’s official release of the 2017 editions, to help improve the online version of the Official Guides. In this fourth post of this series of exclusive previews of the 2017 GMAT Official Guides, we now turn to the verbal section of the main Official Guide. We will focus on how the 2017 GMAT Official Guide differs from the 2016 edition in terms of verbal question difficulty and math concepts.

## Sentence Correction – Difficulty

Both the 2017 and 2016 editions of the GMAT Official Guide contain 158 Sentence Correction questions, including the identical 18 Sentence Correction questions in the Diagnostic Exam portion of the guides. The allocation of question difficulty, as assigned by the GMAC, has slightly shifted away from Hard.

Difficulty 2017 2016 Change
Easy 35 35
Medium 50 45 +5
Hard 73 78 (5)
Total 158 158

A total of 21 new Sentence Correction questions, which we have never seen before, appear in the 2017 GMAT Official Guide, with difficulty ratings of Easy / Medium / Hard as follows: 7 / 9 / 5. This is in lieu of 21 questions from the 2016 edition that have been removed, with difficulty ratings of Easy / Medium / Hard as follows: 7 / 4 / 10. The GMAC has not reclassified the difficulty of any question, so these new and removed questions alone account for the differences in the number of questions per difficulty level.

## Sentence Correction – Concepts

Let’s now consider changes in the concepts of the 21 new (in 2017) and the 21 removed (from 2016) Sentence Correction questions. We have categorized these questions based on the primary grammar concepts that are tested on Sentence Correction.

Concept 2017 2016 Change
Verb Agreement 3 3
Verb Tense 4 4
Pronoun Ambiguity 0 1 (1)
Pronoun Agreement 2 0 +2
Parallel Construction 6 2 +4
Misplaced Modifiers 3 1 +2
Idioms 1 2 (1)
Comparison & Quantity 0 3 (3)
Expression & Meaning 2 5 (3)

Although we cannot draw definite conclusions from this data about question composition on the GMAT, what stands out is the decrease in the Comparison & Quantity and the Expression & Meaning categories, offset by the increase in Parallel Construction related questions . The increase in the Parallel Construction category exactly offsets the decrease in these types of questions in the 2017 Verbal Official Guide.

## Critical Reasoning – Difficulty

Both the 2017 and 2016 editions of the GMAT Official Guide contain 141 Critical Reasoning questions, including the identical 17 Critical Reasoning questions in the Diagnostic Exam portion of the guides. The allocation of question difficulty has very slightly shifted away from Hard.

Difficulty 2017 2016 Change
Easy 41 40 +1
Medium 45 45
Hard 55 56 (1)
Total 141 141

A total of 19 new Critical Reasoning questions, which we have never seen before, appear in the 2017 GMAT Official Guide, with difficulty ratings of Easy / Medium / Hard as follows: 4 / 11 / 4. This is in lieu of 19 questions from the 2016 edition that have been removed, with difficulty ratings of Easy / Medium / Hard as follows: 3 / 11 / 5. The GMAC has not reclassified the difficulty of any question, so these new and removed questions alone account for the differences in the number of questions per difficulty level.

## Critical Reasoning – Concepts

Let’s now consider changes in the concepts of the 19 new (in 2017) and the 19 removed (from 2016) Critical Reasoning questions. We have grouped these questions based on the question type categorization that GMAT Genius uses for Critical Reasoning.

Concept 2017 2016 Change
Weaken 5 3 +2
Strengthen 6 3 +3
Assumption 2 4 (2)
Reasoning 0 3 (3)
Conclusion 3 1 +2
Explain 2 1 +1
Evaluate 0 2 (2)
Boldface 0 0
Complete the Passage 1 2 (1)

Although we cannot draw definite conclusions from this data about question composition on the GMAT, what stands out most is an increase in the Strengthen category offset by a decrease in the Reasoning category.

Both the 2017 and 2016 editions of the GMAT Official Guide contain 156 Reading Comprehension questions, including the identical 17 Reading Comprehension questions in the Diagnostic Exam portion of the guides. The allocation of question difficulty has noticeably shifted towards Medium. This is a bit misleading, however, because the GMAC has upgraded two passages with 11 questions from Easy to Medium, and downgraded two passages with 10 questions form Hard to Medium.

Difficulty 2017 2016 Change
Easy 51 54 (3)
Medium 73 65 +8
Hard 32 37 (5)
Total 156 156

A total of 21 new Reading Comprehension questions, which we have never seen before, appear in the 2017 GMAT Official Guide, with difficulty ratings of Easy / Medium / Hard as follows: 13 / 3 / 5. These 21 questions are in five new passages with difficulty ratings of Easy / Medium / Hard as follows: 3 / 1 / 1.

A total of 21 questions have been removed from the 2016 edition, with difficulty ratings of Easy / Medium / Hard as follows: 5 / 16 / 0. This represents three passages with difficulty ratings of Easy / Medium / Hard as follows: 1 / 2 / 0. Let’s further break down how each of these difficulty categories has changed.

13 new questions

Subtractions:
5 question removed

Net change: -3 questions

3 new questions

Subtractions:
16 questions removed

Net change: +8 questions

5 new questions

Subtractions:

Net change: -5 questions

Let’s now consider changes in the concepts of the 21 new (in 2017) and the 21 removed (from 2016) Reading Comprehension questions. We have grouped these questions based on the question type categorization that GMAT Genius uses for Reading Comprehension.

Concept 2017 2016 Change
Primary Purpose 3 3
Author’s Tone 0 0
Organization 0 0
Function 1 3 (2)
Specific Reference 5 8 (3)
Inference 9 7 +2
Critical Reasoning 3 0 +3

Although we cannot draw definite conclusions from this data about question composition on the GMAT, what stands out most is the decrease in the Specific Reference category and the increase in the Critical Reasoning category.

## Removed Questions

Here is the list of the verbal questions in the 2016 edition of the GMAT Official Guide that have been removed . We’ll soon publish a list of the new verbal questions in the 2017 GMAT Official Guides.

### Sentence Correction – 21 questions removed:

5, 6, 15, 16, 20, 24, 26, 34, 44, 45, 65, 76, 82, 83, 88, 89, 92, 93, 108, 109, 122

### Critical Reasoning – 19 questions removed:

6, 13, 19, 40, 44, 45, 46, 47, 50, 51, 52, 56, 61, 62, 80, 95, 96, 98, 99

### Reading Comprehension – 21 questions removed:

26 to 30, 48 to 54, 78 to 86

## Summary

In the 2017 GMAT Official Guide, the GMAC has replaced a total of 61 Verbal questions, representing just over 15% of the questions (excluding the Diagnostic Exam section). The changes in this edition are far less significant than the changes we saw between the 2015 to the 2016 editions of this book. Next up from GMAT Genius — look for detailed reviews and analysis of the 2017 GMAT Official Guides.

## Preview of 2017 GMAT Official Guide Math

In this third post of this series of exclusive previews of the 2017 GMAT Official Guides, we now turn to the math section of the main Official Guide. We will focus on how the 2017 GMAT Official Guide differs from the 2016 edition in terms of math question difficulty and math concepts.

## Problem Solving – Difficulty

Both the 2017 and 2016 editions of the GMAT Official Guide contain 254 Problem Solving questions, including the identical 24 Problem Solving questions in the Diagnostic Exam portion of the guides. But the allocation of question difficulty, as assigned by the GMAC, has noticeably shifted towards Easy difficulty. Part of this change resulted from the GMAC downgrading 8 questions from Medium difficulty (in 2016) to Easy (in 2017).

Difficulty 2017 2016 Change
Easy 82 63 +19
Medium 55 60 (5)
Hard 117 131 (14)
Total 254 254

A total of 36 new Problem Solving questions, which we have never seen before, appear in the 2017 GMAT Official Guide, with difficulty ratings of Easy / Medium / Hard as follows: 18 / 8 / 10. This is in lieu of 36 questions from the 2016 edition that have been removed, with difficulty ratings of Easy / Medium / Hard as follows: 7 / 5 / 24. We are disappointed to see that Hard difficulty has a net loss of 14 questions, although we would rate most of the 24 removed Hard questions as actually Medium difficulty. Let’s further break down how each of these difficulty categories has changed.

### Easy Problem Solving

18 new questions

Subtractions:
7 questions removed

Net change: +19 questions

### Medium Problem Solving

8 new questions

Subtractions:
5 questions removed

Net change: -5 questions

### Hard Problem Solving

10 new questions

Subtractions:
24 questions removed

Net change: -14 questions

## Problem Solving – Concepts

Let’s now consider changes in the concepts of the 36 new (in 2017) and the 36 removed (from 2016) Problem Solving questions. GMAT Genius classifies questions based on their primary and secondary concepts. In order to observe trends, we have condensed our categorization as follows:

Type Concept 2017 2016 Change
Arithmetic Basic 2 0 +2
Arithmetic Divisibility/Factors/Mult. 1 2 (1)
Arithmetic Exponents & Roots 1 1
Arithmetic Fractions & Ratios 3 6 (3)
Arithmetic Percents 5 6 (1)
Algebra Inequalities 2 0 +2
Algebra Linear Equations 2 3 (1)
Algebra Simultaneous Equations 2 2
Algebra Variables in Answers 3 1 +2
Geometry Circles 1 1
Geometry Coordinate 0 1 (1)
Statistics Averages 2 3 (1)
Statistics Other 3 1 +2
Word Problems Combinatorics 1 0 +1
Word Problems Functions & Sequences 1 1
Word Problems Groups/Sets 1 2 (1)
Word Problems Probability 2 2
Word Problems Rate & Work 2 2

Although we cannot draw definite conclusions from this data about question composition on the GMAT, what stands out most is the decrease in fractions & ratios questions.

## Data Sufficiency – Difficulty

Both the 2017 and 2016 editions of the GMAT Official Guide contain 198 Data Sufficiency questions, including the identical 24 Data Sufficiency questions in the Diagnostic Exam portion of the guides. As with Problem Solving, the allocation of question difficulty has noticeably shifted away from Hard. No questions have been reclassified in terms of difficulty.

Difficulty 2017 2016 Change
Easy 50 46 +4
Medium 51 41 +10
Hard 97 111 (14)
Total 198 198

A total of 26 new Data Sufficiency questions, which we have never seen before, appear in the 2017 GMAT Official Guide, with difficulty ratings of Easy / Medium / Hard as follows: 9 / 12 / 5. This is in lieu of 26 questions from the 2016 edition that have been removed, with difficulty ratings of Easy / Medium / Hard as follows: 5 / 2 / 19. We are disappointed to see that Hard difficulty has a net loss of 14 questions, although we would rate most of the 19 removed Hard questions as actually Medium difficulty. Let’s further break down how each of these difficulty categories has changed.

### Easy Data Sufficiency

9 new questions

Subtractions:
5 questions removed

Net change: +4 questions

### Medium Data Sufficiency

12 new questions

Subtractions:
2 questions removed

Net change: +10 questions

### Hard Data Sufficiency

5 new questions

Subtractions:
19 questions removed

Net change: -14 questions

## Data Sufficiency – Concepts

Let’s now consider changes in the concepts of the 26 new (in 2017) and the 26 removed (from 2016) Data Sufficiency questions. GMAT Genius classifies questions based on their primary and secondary concepts. In order to observe trends, we have condensed our categorization as follows:

Type Concept 2017 2016 Change
Arithmetic Basic 5 2 +3
Arithmetic Divisibility/Factors/Mult. 1 0 +1
Arithmetic Exponents & Roots 3 2 +1
Arithmetic Fractions & Ratios 1 1
Arithmetic Percents 3 2 +1
Arithmetic Pos/Neg & Odd/Even 1 4 (3)
Arithmetic Primes 1 0 +1
Algebra Linear Equations 1 0 +1
Algebra Simultaneous Equations 1 2 (1)
Geometry Circles 0 2 (2)
Geometry Triangles 3 1 +2
Geometry Other 1 0 +1
Statistics All 1 0 +1
Word Problems Groups/Sets 2 3 (1)
Word Problems Probability 1 1
Word Problems Revenue/Profit/Interest 0 3 (3)

Although we again cannot draw definite conclusions from this data about question composition on the GMAT, what stands out most is the decrease in odd/even and revenue/profit concepts .

## Removed Questions

Here is the list of the math questions that have been removed from the 2016 edition of the GMAT Official Guide. We’ll publish a list of the new math questions in the 2017 GMAT Official Guide after it publicly releases.

### Problem Solving – 36 questions removed:

26, 34, 37, 40, 41, 47, 54, 65, 72, 79, 80, 103, 110, 111, 150, 157, 161, 169, 176, 179, 180, 184, 186, 187, 194, 197, 198, 199, 200, 202, 203, 207, 208, 209, 227, 228

### Data Sufficiency – 26 questions removed:

1, 3, 9, 17, 33, 44, 65, 74, 78, 81, 109, 113, 131, 139, 140, 141, 150, 151, 154, 158, 159, 165, 166, 170, 173, 174

## Summary

In the 2017 GMAT Official Guide, the GMAC has replaced a total of 62 Quant questions, representing just over 15% of the questions (excluding the Diagnostic Exam section). The changes in this edition are far less significant than the changes we saw between the 2015 to the 2016 editions of this book. Nonetheless, what stands out is the net loss of 28 Hard Quant questions, as rated by the GMAC. GMAT Genius will continue to offer detailed analysis of the 2017 GMAT Official Guides in the coming weeks. Stay tuned!

## Preview of 2017 GMAT Verbal Official Guide

GMAT Genius has been working closely with the publisher of the Official Guides for GMAT Review over the past few weeks, in advance of the June 7 release of the 2017 editions, to help improve the online version of the Official Guides. In doing so, we have thoroughly analyzed the 2017 versions of the GMAT Official Guides, and want to give you an overview of what to expect. In this post, we will focus specifically on how the 2017 GMAT Verbal Official Guide differs from the 2016 edition in terms of question difficulty and math concepts.

## Sentence Correction – Difficulty

Both the 2017 and 2016 editions of the GMAT Verbal Official Guide contain 113 Sentence Correction questions. The allocation of GMAC question difficulty remains unchanged.

Difficulty 2017 2016 Change
Easy 31 31
Medium 51 51
Hard 31 31
Total 113 113

A total of 17 new Sentence Correction questions, which we have never seen before, appear in the 2017 GMAT Verbal Official Guide, with difficulty ratings of Easy / Medium / Hard as follows: 6 / 7 / 4. This is in lieu of 17 questions from the 2016 edition that have been removed, with difficulty ratings of Easy / Medium / Hard as follows: 5 / 6 / 6. The GMAC has also upgraded the difficulty of three questions (#31, #81, and #82 in the 2016 edition).

Among the six Hard questions removed, we consider four Very Hard (a difficulty rating that we assign to less than 10% of the questions). These are questions #87, #90, #107, and #113 (in the 2016 edition). Unfortunately none of the newly-added questions qualify as Very Hard. Let’s further break down how each of the GMAC difficulty categories has changed.

### Easy Sentence Correction

6 new questions

Subtractions:
5 questions removed

Net change:

### Medium Sentence Correction

7 new questions

Subtractions:
6 questions removed

Net change:

### Hard Sentence Correction

4 new questions

Subtractions:
6 questions removed

Net change:

## Sentence Correction – Concepts

Let’s now consider changes in the concepts of the 17 new (in 2017) and the 17 removed (from 2016) Sentence Correction questions. We have categorized these questions based on the primary grammar concepts that are tested on Sentence Correction.

Concept 2017 2016 Change
Verb Agreement 0 1 (1)
Verb Tense 3 1 +2
Pronoun Ambiguity 1 3 (2)
Pronoun Agreement 3 3
Parallel Construction 2 6 (4)
Misplaced Modifiers 3 0 +3
Idioms 3 1 +2
Comparison & Quantity 1 1
Expression & Meaning 1 1

Although we cannot draw definite conclusions from this data about question composition on the GMAT, we clearly see a decrease in parallelism-related questions. This isn’t overly surprising, however, because Parallel Construction was and remains the biggest grammar category.

## Critical Reasoning – Difficulty

Both the 2017 and 2016 editions of the GMAT Verbal Official Guide contain 83 Critical Reasoning questions. The allocation of question difficulty, as assigned by the GMAC, remains unchanged.

Difficulty 2017 2016 Change
Easy 34 34
Medium 26 26
Hard 23 23
Total 83 83

A total of 13 new Critical Reasoning questions, which we have never seen before, appear in the 2017 GMAT Verbal Official Guide, with difficulty ratings of Easy / Medium / Hard as follows: 6 / 3 / 4. This is in lieu of 13 questions from the 2016 edition that have been removed, with difficulty ratings of Easy / Medium / Hard as follows: 7 / 3 / 3. In our assessment, the overall difficulty of the newly-added questions is harder than that of the removed questions. The GMAC has also downgraded the difficulty of two questions (#35 and #61in the 2016 edition). Let’s further break down how each of these difficulty categories has changed.

### Easy Critical Reasoning

6 new questions

Subtractions:
7 question removed

Net change:

### Medium Critical Reasoning

3 new questions

Subtractions:
3 questions removed

Net change:

### Hard Critical Reasoning

4 new questions

Subtractions:
3 questions removed

Net change:

## Critical Reasoning – Concepts

Let’s now consider changes in the concepts of the 13 new (in 2017) and the 13 removed (from 2016) Critical Reasoning questions. We have grouped these questions based on the question type categorization that GMAT Genius uses for Critical Reasoning.

Concept 2017 2016 Change
Weaken 2 4 (2)
Strengthen 3 4 (1)
Assumption 1 2 (1)
Reasoning 1 0 +1
Conclusion 1 1
Explain 1 0 +1
Evaluate 1 2 (1)
Boldface 1 0 +1
Complete the Passage 2 0 +2

Although we cannot draw definite conclusions from this data about question composition on the GMAT, what stands out most is the increase in the Complete the Passage category.

Both the 2017 and 2016 editions of the GMAT Verbal Official Guide contain 105 Reading Comprehension questions. The allocation of question difficulty, as assigned by the GMAC, has noticeably shifted towards Hard. This is a bit misleading, however, because the GMAC has upgraded one passage with eight questions from Medium to Hard.

Difficulty 2017 2016 Change
Easy 28 26 +2
Medium 37 47 (10)
Hard 40 32 +8
Total 105 105

A total of 15 new Reading Comprehension questions, which we have never seen before, appear in the 2017 GMAT Verbal Official Guide, with difficulty ratings of Easy / Medium / Hard as follows: 6 / 9 / 0. These 15 questions are in two new passages, one rated Easy difficulty and one rated Medium. A total of 15 questions from the 2016 edition have been removed, all with Medium difficulty rating. This represents three passages. Let’s further break down how each of these difficulty categories has changed.

6 new questions

Subtractions:

Net change: +2 questions

9 new questions

Subtractions:
15 questions removed

Net change: -10 questions

Subtractions:
none

Net change: +8 questions

Let’s now consider changes in the concepts of the 15 new (in 2017) and the 15 removed (from 2016) Reading Comprehension questions. We have grouped these questions based on the question type categorization that GMAT Genius uses for Reading Comprehension.

Concept 2017 2016 Change
Primary Purpose 1 2 (1)
Author’s Tone 1 1
Organization 0 0
Function 1 2 (1)
Specific Reference 4 6 (2)
Inference 7 4 +3
Critical Reasoning 1 0 +1

Although we cannot draw definite conclusions from this data about question composition on the GMAT, what stands out most is the increase in the Inference category.

## Removed Questions

Here is the list of the questions that have been removed from the 2016 edition of the GMAT Verbal Official Guide. We’ll publish a list of the new questions in the 2017 GMAT Verbal Official Guide after it publicly releases.

### Sentence Correction – 17 questions removed:

4, 10, 17, 22, 29, 36, 41, 54, 58, 75, 78, 87, 90, 102, 107, 110, 113

### Critical Reasoning – 13 questions removed:

4, 5, 8, 12, 26, 31, 32, 45, 49, 51, 65, 76, 77

### Reading Comprehension – 15 questions removed:

36 to 38, 43 to 48, 49 to 54

## Summary

In the 2017 GMAT Verbal Official Guide, the GMAC has replaced a total of 45 questions, representing 15% of the questions. The changes in this edition are far less significant than the changes we saw between the 2015 to the 2016 editions of this book. GMAT Genius will offer much more detailed analysis and critique of the 2017 GMAT Official Guides in the coming weeks. Stay tuned!

## Preview of 2017 GMAT Quantitative Official Guide

GMAT Genius has been working closely with the publisher of the Official Guides for GMAT Review over the past few weeks, in advance of the June 7 release of the 2017 editions, to help improve the online version of the Official Guides. In doing so, we have thoroughly analyzed the 2017 versions of the GMAT Official Guides, and want to give you an overview of what to expect. In this post, we will focus specifically on how the 2017 GMAT Quantitative Official Guide differs from the 2016 edition in terms of question difficulty and math concepts.

## Problem Solving – Difficulty

Both the 2017 and 2016 editions of the GMAT Quantitative Official Guide contain 176 Problem Solving questions. The allocation of question difficulty, as assigned by the GMAC, has slightly shifted away from Medium. Part of this change resulted from the GMAC downgrading two questions from Medium difficulty (in the 2016 edition) to Easy (in the 2017 edition).

Difficulty 2017 2016 Change
Easy 85 82 +3
Medium 52 57 (5)
Hard 39 37 +2
Total 176 176

A total of 26 new Problem Solving questions, which we have never seen before, appear in the 2017 GMAT Quantitative Official Guide, with difficulty ratings of Easy / Medium / Hard as follows: 17 / 5 / 4. Of the four new Hard questions, we actually consider one Easy and one Medium. These new questions are in lieu of 26 questions from the 2016 edition that have been removed, with difficulty ratings of Easy / Medium / Hard as follows: 16 / 8 / 2. Let’s further break down how each of these difficulty categories has changed.

### Easy Problem Solving

17 new questions

Subtractions:
16 questions removed

Net change: +3 questions

### Medium Problem Solving

5 new questions

Subtractions:
8 questions removed

Net change: -5 questions

### Hard Problem Solving

4 new questions

Subtractions:
2 questions removed

Net change: +2 questions

## Problem Solving – Concepts

Let’s now consider changes in the concepts of the 26 new (in 2017) and the 26 removed (from 2016) Problem Solving questions. GMAT Genius classifies questions based on their primary and secondary concepts. In order to observe trends, we have condensed our categorization as follows:

Type Concept 2017 2016 Change
Arithmetic Basic 5 1 +4
Arithmetic Divisibility & Factors 1 2 (1)
Arithmetic Exponents & Roots 1 3 (2)
Arithmetic Fractions & Ratios 3 2 +1
Arithmetic Percents 3 4 (1)
Algebra Linear Equations 0 3 (3)
Algebra Simultaneous Equations 1 0 +1
Algebra Variables in Answers 1 1
Geometry All Geometry 3 3
Statistics Averages 2 1 +1
Statistics Other Statistics 2 1 +1
Word Problems Combinatorics 1 0 +1
Word Problems Groups/Sets 0 1 (1)
Word Problems Rate & Work 1 2 (1)

Although we cannot draw definite conclusions from this data about question composition on the GMAT, what stands out is the decrease in algebraic linear equations and the increase in basic arithmetic.

## Data Sufficiency – Difficulty

Both the 2017 and 2016 editions of the GMAT Quantitative Official Guide contain 124 Data Sufficiency questions. The allocation of question difficulty, as assigned by the GMAC, has noticeably shifted away from Hard. This is a bit misleading, however, because we would rate all five of the new Hard questions as Hard, whereas we would rate only three of the 15 removed Hard questions as actually Hard.

Difficulty 2017 2016 Change
Easy 26 22 +4
Medium 31 25 +6
Hard 67 77 (10)
Total 124 124

A total of 19 new Data Sufficiency questions, which we have never seen before, appear in the 2017 GMAT Quantitative Official Guide, with difficulty ratings of Easy / Medium / Hard as follows: 7 / 7 / 5. This is in lieu of 19 questions from the 2016 edition that have been removed, with difficulty ratings of Easy / Medium / Hard as follows: 3 / 1 / 15. Since no questions have been assigned a different difficulty, these new and removed questions alone account for the differences in the number of questions per difficulty level.

## Data Sufficiency – Concepts

Let’s now consider changes in the concepts of the 19 new (in 2017) and the 19 removed (from 2016) Data Sufficiency questions. GMAT Genius classifies questions based on their primary and secondary concepts. In order to observe trends, we have condensed our categorization as follows:

Type Concept 2017 2016 Change
Arithmetic Divisibility/Factors/Mult. 2 1 +1
Arithmetic Exponents & Roots 1 1
Arithmetic Fractions & Ratios 1 1
Arithmetic Pos/Neg & Odd/Even 1 1
Arithmetic Primes 1 1
Algebra Inequalities 2 2
Algebra Linear Equations 0 1 (1)
Algebra Simultaneous Equations 2 1 +1
Geometry All Geometry 3 3
Statistics All Statistics 1 2 (1)
Word Problems Functions & Sequences 1 0 +1
Word Problems Groups/Sets 1 2 (1)
Word Problems Revenue/Profit 1 1
Word Problems Rate & Work 1 1

No specific trends stand out from this data about question composition.

## Removed Questions

Here is the list of the questions that have been removed from the 2016 edition of the GMAT Quantitative Official Guide. We’ll publish a list of the new questions in the 2017 GMAT Quantitative Official Guide after it publicly releases.

### Problem Solving – 26 questions removed:

14, 23, 27, 30, 32, 36, 37, 41, 43, 44, 46, 53, 54, 56, 57, 66, 91, 92, 103, 112, 123, 130, 137, 138, 168, 170

### Data Sufficiency – 19 questions removed:

14, 19, 22, 33, 51, 54, 59, 61, 67, 80, 83, 87, 90, 97, 100, 101, 103, 107, 114

## Summary

In the 2017 GMAT Quantitative Official Guide, the GMAC has replaced a total of 45 questions, representing 15% of the questions. The changes in this edition are far less significant than the changes we saw between the 2015 to the 2016 editions of this book. GMAT Genius will offer much more detailed analysis and critique of the 2017 GMAT Official Guides in the coming weeks. Stay tuned!

## GMAT Score Cancellation and Reinstatement Periods

The Graduate Management Admission Council recently announced longer GMAT score cancellation and score reinstatement time periods. These changes are beneficial to GMAT test takers, and expand upon the enhanced score cancellation features that the GMAC introduced in July 2015.

## GMAT Score Cancellation Options

You can continue to cancel your scores immediately upon completion of the GMAT. After you see your scores, you have two minutes in which to either cancel or report your test scores. This option remains free, and removes any indication of a test attempt from your score reports.

A new option allows you to cancel your GMAT scores within 72 hours of your test administration, for a \$25 fee. You take advantage of this option online, by logging in to your MBA.com account. As with the immediate cancellation option, your score reports will have no record of the GMAT administration.

## Enhanced Score Reinstatement Period

You previously had 60 days to reinstate cancelled scores, for a \$100 fee. You can now reinstate cancelled scores up to 4 years 11 months after your exam date. Furthermore, the GMAC has lowered the score reinstatement fee to \$50 and will now automatically send score reports to the schools that you selected during your exam. You also take advantage of this option online at your MBA.com account.

## GMAT Genius’ Interpretation

As the GMAT faces greater competition from the GRE, the GMAC has been striving to introduce greater flexibility and control to GMAT takers. Rather than deciding immediately, you can now more carefully consider over the subsequent three days whether to cancel your GMAT scores. You can also seek the advice of others, such as your GMAT tutor, before deciding whether to cancel. The longer timeframe should reduce the pressure you face over this decision after completing a grueling exam.

The enhanced score reinstatement period also provides greater flexibility, now at a much more reasonable cost. You can cancel your GMAT scores knowing that you are able to reinstate the scores at any time during their 5-year validity. As a result, we expect that many more MBA aspirants will cancel their scores when they don’t meet their score objectives, and then ultimately reinstate their highest scores after further GMAT attempts. You can read more about the changes on mba.com.

## Select Section Order Pilot Program

The GMAC’s select section order pilot begins today! This special program, by invitation only, allows a very select few repeat GMAT takers to choose the order of their exam sections. This pilot program will provide the GMAC with data to assess whether to roll the select section order option out to all test takers. Program participants must take the GMAT from February 23 to March 16.

Participants will receive valid GMAT scores, and score reports will not indicate that they participated in this special select section order program. This is akin to receiving a golden ticket from the GMAC. You get to tackle the mentally draining Quant and Verbal sections before working on the AWA and IR sections that do not count towards the main 200 to 800 score. As a result, we estimate an overall score improvement of 30 to 40 points, consistent with what we observe when students take a practice exam without doing the AWA and IR sections.

## How Select Section Order Works

If you are participant in the pilot program, you register for the GMAT using a special link that is sent to you. You will have the opportunity to select from one of four possible section orders that differ from the normal order of AWA, IR, Quant, Verbal:

1. Quant, Verbal, IR, AWA
2. Quant, Verbal, AWA, IR
3. Verbal, Quant, IR, AWA
4. AWA, IR, Verbal, Quant

## What Order to Choose

We highly recommend taking selecting option 1 (Quant, Verbal, IR, AWA) or option 3 (Verbal, Quant, IR, AWA). Since it is by far the easiest section of the GMAT, save AWA for last, at which point mental fatigue is likely to set in.

Start with either Quant or Verbal, depending on which section mental fatigue is most likely to be a factor. Start with the section on which you are most likely to make careless errors. This will typically, but not necessarily, be the section you are weaker on. By tackling this section first while you are still fresh, the number of careless mistakes is likely to decline.

## Should You Participate in the Program

Absolutely! Some other test preparation companies have proposed two nonsensical reasons to avoid participating in the select section order program.

1. Since existing practice exams do not have the select section order option, you cannot practice with a different order. Our response: so what? We are confident that you are adaptable enough to take the test sections in a more advantageous order than with what you can practice.
2. You should allow for a warm-up period. Our response: one hour spent on AWA and Integrated Reasoning hardly qualifies as a “warm-up” period. Rather, the vast majority of GMAT aspirants will expend valuable energy and focus on the two sections of the exam that do not count towards your primary overall score. If you really want a “warm up” period, before entering the test center, practice with a very small handful of Official Guide questions that you have previously done. Be sure not to bring any practice materials into the test center.

Other than not receiving an invitation, there are only two valid reasons not to participate: 1) you do not plan to retake the GMAT or 2) you will not be adequately prepared to retake the GMAT in the program’s timeframe. After all, why pass up the opportunity to boost your GMAT score?

Some of GMAT Genius’ clients have been invited to participate in the select section order pilot. We’ll share the results after the pilot program concludes. In the mean time, here are the official GMAC FAQs on the program.

## 2015 GMAT Percentile Rankings

Every year, the Graduate Management Admission Council updates the percentile rankings associated with different GMAT scores. Although your actual scores don’t change, the percentiles on your score reports are updated to reflect the latest three-years of data from live GMAT administrations. The GMAC recently released its latest percentile rankings, reflecting data from July 2012 through June 2015.

Percentile rankings indicate the percent of test-takers who score below a given score. In the tables below, we show data for the three-years ending June 2015 and the prior data for the three-years ending June 2014. For your convenience, we have highlighted the specific changes. Read more about the meaning of percentile rankings on our About the GMAT page. You can access the latest full percentile ranking tables at MBA.com.

## Overview of Changes in Percentile Rankings

As expected, there are no drastic changes to the percentile rankings, only minor shifts. The AWA percentile rankings are completely unchanged. There are just minor shifts in the Integrated Reasoning and Verbal percentile rankings.

The most noticeable change is the slightly higher mean average overall GMAT score accompanied by a slight shift downward in percentile rankings corresponding to a given score. This is driven by similar changes in the Quantitative percentile rankings. As test-takers from math-proficient countries such as China and India continue to make up a larger proportion of the test-taking population, it becomes harder to achieve a high-ranking in the Quantitative section. To illustrate, consider that a Quant score of 50 (out of 51 for all practical purposes) translates only into an 87% ranking.

## Data from 2015 GMAT Percentile Rankings

Scores Halfway Mean Median 70th %ile 90th %ile
AWA 3.0 = 6% 4.34 = 30% 4.5 = 44% 5.0 = 60% 6.0 = 92%
IR 5 = 53% 4.32 = 43% 5 = 53% 6 = 67% 8 = 92%
Verbal 30 = 58% 27.1 = 46% 28 = 50% 34 = 71% 40 = 91%
Quantitative 30 = 22% 38.3 = 39% 42 = 50% 47 = 67% 50 = 87%
Overall 500 = 30% 550.1 = 44% 570 = 50% 630 = 70% 700 = 89%

Note: Percentiles for mean scores are estimates.

## Data from 2014 GMAT Percentile Rankings

Scores Halfway Mean Median 70th %ile 90th %ile
AWA 3.0 = 6% 4.34 = 30% 4.5 = 44% 5.0 = 60% 6.0 = 92%
IR 5 = 52% 4.33 = 42% 5 = 52% 6 = 67% 8 = 92%
Verbal 30 = 58% 27.0 = 46% 28 = 51% 34 = 71% 40 = 91%
Quantitative 30 = 22% 38.0 = 41% 42 = 51% 47 = 68% 50 = 88%
Overall 500 = 31% 547.4 = 44% 570 = 51% 630 = 71% 700 = 89%

Note: Percentiles for mean scores are estimates.