Riten, what is your target GMAT score? Are you aiming to apply to HBS, Wharton, Sloan, Kellogg, and Tuck? I am just wondering.
The following is little bit more information about GMAT books those were listed above by you and hyperthread.
1. Official Guide for GMAT Review 11th edition has 800+ practice questions (Problem Solving=249, Data Sufficiency=155, Reading Comprehension=141, Sentence Correction=138, Critical Reasoning=124)
2. Official Guide for GMAT Quantitative Review has 300 practice questions (Problem Solving=176 and Data Sufficiency=114)
3. Official Guide for GMAT Verbal Review has 300 total questions (Reading Comprehension=105, Sentence Correction=113, Critical Reasoning=82)
Total of 1400 questions you all get to practice to hone your GMAT skills. So, my recommendation to prep your GMAT is as following:
1. KAPLAN GMAT Premier program, which comes with CD (KAPLAN Comprehensive that dose not come with CD is cheaper and I would not recommend it)
2. KAPLAN GMAT Verbal workbook
3. KAPLAN GMAT Math Workbook (Don't fool yourself that you are math genius. You need tricks and strategies to do well if you are aiming to score 45+ scaled subscore in quantitative section and this book will help you to achieve higher score)
4. Manhattan GMAT prep Sentence Correction. I feel its like bible for GMAT Sentence Correction (ps. if you can afford to buy all seven series of Manhattan GMAT Prep, that will be great but at least Manhattan Sentence Correction is must)
5. All Official Guide GMAT books
6. Join GMAT Club to learn more tricks for Statistics, Combinatorial, Probability, and hardest mind boggling possible GMAT questions.
Good luck
I think so