Hi peeteee,
Taking lots of CATs is not what will make you a better Test Taker. A CAT is really a 'measuring device' - when used correctly, it will give you a realistic score and help define your strengths and weaknesses, but it will NOT help you to fix any of those weaknesses. To raise your scores, you have to learn the necessary Tactics and put in the proper practice and repetitions. The CAT will show you whether your studies are helping you to improve or not.
From what you describe, you've been performing at a fairly consistent level. Assuming that you've taken your CATs in a realistic, test-like fashion, then it's possible that these Scores are reflective of your current skills - and it's also possible that 'your way' of approaching the Test has gotten you "stuck" at this level. 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) How long have you studied?
2) What study materials have you used so far?
3) On what dates did you take EACH of your CATs and how did you score on EACH (including the Quant and Verbal Scaled Scores for EACH)?
Goals:
4) What is your goal score?
5) When are you planning to take the GMAT?
6) When are you planning to apply to Business School?
7) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich