Hi Pavan,
It's not clear what you mean when you ask if a particular book is 'sufficient?' Before I can offer you any advice for your studies, it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) On what dates did you take each of your Official GMATs?
2) How long have you studied in total? Over the last 3 months, many hours have you typically studied each week?
3) What study materials have you used over the course of all of your studies?
4) 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)?
Goals:
5) What is your overall goal score?
6) When are you planning to apply to Business School and what Schools are you planning to apply to?
You might also choose to purchase the Enhanced Score Report for your most recent Official GMAT. While the ESR doesn’t provide a lot of information, there are usually a few data points that we can use to define what went wrong on Test Day (and what you should work on to score higher). If you purchase the ESR, then I'll be happy to analyze it for you.
GMAT assassins aren't born, they're made,
Rich