Hi Binay,
Approximately 3 months ago (near the end of April), you stated that you had started your studies. From this post, it sounds as though you might not have used any of the Official Guide materials yet - so what study routine have you been following over the last 3 months?
Using some version of the Official Guide (either in print or the e-book) would be a smart choice, as either one is a great source for realistic practice questions. That having been said, those sources are not designed to teach you Tactics, patterns or the little 'secrets' behind the GMAT - for those, you'll need Course-oriented materials.
Before I can offer you any additional 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) How long have you studied? How many hours do you typically study each week?
2) What study materials have you used so far?
3) 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:
4) What is your overall goal score?
5) When are you planning to take the GMAT?
6) 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