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The 5 Best GMAT Prep Books · 1. The GMAT Official Guide · 2. The Critical Reasoning Bible (PowerScore) · 3. The GMAT Sentence Correction Strategy Guide (Manhattan The GMAT Official Guide series are the ONLY study guides that feature real questions from past GMAT exams, offered exclusively from the makers of the exam. With All the GMAT: Content Review, Set of 3 Books, Includes 6 Online Practice Tests, Effective Strategies to Score Higher (Manhattan Prep GMAT Strategy Guides).