GMAT official guide 2021

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"Study with confidence. All GMAT™ Official Prep products are the only prep resources containing real GMAT™ questions from past exams. It's why we are official. Get comprehensive practice by studying with 1,172 questions across quantitative and verbal reasoning from past GMAT™ exams. Answer explanations are included so that you can study the reasoning behind the answers to help improve your understanding and performance. The questions in each section are organized by difficulty level: easy, medium and hard. Start at the beginning and work your way up to the harder questions as you build upon your knowledge" --Amazon