Hi Foxter,
While working through a certain number of practice questions should be expected, you have to be careful about confusing 'quantity' of study with 'quality' of study. In simple terms, if you're approaching GMAT questions in inefficient ways, then sticking with those 'bad habits' through 100s or even 1000s of practice questions could end up getting you stuck at a particular score level.
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) How long have you studied? How many hours do you typically study each week?
2) Have you used any other study materials besides the books that you mentioned?
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 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