Letter from the President and CEO, GMAC xi

1.0 What Is the GMAT Exam? 2
1.1 What Is the GMAT Exam? 3
1.2 Why Take the GMAT Exam? 3
1.3 GMAT Exam Format 4
1.4 What Is the Testing Experience Like? 6
1.5 What Is the Exam Content Like? 6
1.6 Data Insights Section 6
1.7 How Are Scores Calculated? 8

2.0 How to Prepare 10
2.1 How Should I Prepare for the GMAT Exam? 11
2.2 Getting Ready for Exam Day 11
2.3 How to Use the GMAT Official Guide Data Insights Review 2026–2027 12
2.4 How to Use Other GMAT Official Prep Products 14
2.5 Tips for Taking the Exam 14
2.6 Data Insights Section Strategies 16

3.0 Math Review 18
3.0 Math Review 19
3.1 Value, Order, and Factors 20
3.2 Algebra, Equalities, and Inequalities 28
3.3 Rates, Ratios, and Percents 42
3.4 Statistics, Sets, Counting, Probability, Estimation, and Series 52
3.5 Reference Sheets 64

4.0 Verbal Review 76
4.0 Verbal Review 77
4.1 Analyzing Passages 77
4.2 Inductive Reasoning 84
4.3 Deductive Reasoning 90

5.0 Data Insights Review 100
5.0 Data Insights Review 101
5.1 Data Sets and Types 101
5.2 Data Displays 106
5.3 Data Patterns 116

6.0 Data Insights 122
6.0 Data Insights 123
6.1 What Is Measured 124
6.2 Question Types and Test-Taking Strategies 125
6.3 Online Question Bank Instructions 132
6.4 Practice Questions: Data Sufficiency 133
6.5 Answer Key: Data Sufficiency 146
6.6 Answer Explanations: Data Sufficiency 147
6.7 Practice Questions: Two-Part Analysis 198
6.8 Answer Key: Two-Part Analysis 219
6.9 Answer Explanations: Two-Part Analysis 221

7.0 GMAT Official Guide Data Insights Review Question Index 268
7.0 GMAT Official Guide Data Insights Review Question Index 269

Appendix A Answer Sheets 276
Data Sufficiency Answer Sheet 277
Two-Part Analysis Answer Sheet 278