During my 5-month preparation for GMAT, I referred almost all the books available in the market. While some of them were awesome, the others were so so. Here is my take on them:

a)    Official Guide and Official Guide Verbal – Absolute must, they are like bibles for the preparation. Most of the questions in actual GMAT are more or less like the ones in OG. Go through this book once and keep revising it to strengthen your concepts and to get familiar with the GMAT-style questions. This is the book to start your preparation with.

b)    Manhattan series – Very good book series More >