Hi Shikhar22,
From your post history, it appears that you've been studying for at least the last 4 months - so if you're now thinking in terms of when you should schedule your Official GMAT (re: maybe sometime soon), then we should take a closer look at how you've been performing on your CATs/mocks. As far as broader practice materials are concerned, there are plenty of high-quality materials besides the OG books - and if your goal is to score at a high level overall, your focus needs to be on honing all of the necessary Tactical skills (and not on parsing out OG questions).
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? What brands of CATs/mocks have you used?
3) On what dates (or approximate 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 apply to Business School and what Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich