Hi Rishav7,
From your message, it's not clear whether you're just beginning your studies or you've been studying for some time. In simple terms, are you thinking about starting off with this book or have you worked through a bunch of GMAT materials already and you're trying to determine what materials to use next?
Beyond that question, I'd like to know a bit more information on your timeline and your goals:
1) Have you taken any practice CATs/mocks yet? On what dates did you take EACH of your CATs/mocks and how did you score on EACH (including the Quant and Verbal Scaled Scores for EACH)?
2) What is your overall goal score?
3) When are you planning to take the GMAT?
4) When are you planning to apply to Business School and what Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich