Hi tanveer7d,
GMAC has publicly stated that the Official Score that you earn on Test Day is within +/- 30 points of actual ability. Assuming a similar 'swing' in how your CATs function - and that you took your CATs in a realistic fashion that matches-up with how you will take the Official GMAT - 3 of your recent CAT score results show that you essentially performed the same each time (about 660 +/- a few points). The most recent result is an 'outlier' relative to the other values, so you might just have had a bit of a 'bad day' when you took that last CAT. That having been said, if you were taking your CATs in an unrealistic fashion, then it's unclear what your actual 'ability level' is right now - and if your Exam is in just a few days, then that does not give us a lot of time to diagnose or 'fix' any of the issues that might be keeping you from scoring higher.
Before I can offer you the specific advice that you’re looking for, it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) What type of study routine have you been following over the last year? Over the last 3 months, how many hours do you typically study each week?
2) What study materials have you used so far?
3) You listed just 4 CAT/mock results, but you've clearly taken at least 2 other CATs. 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