Hi Tom,
Assuming that you're interested in learning what to focus on in your studies - so that you can score higher on the GMAT - the only way to properly assess whether you have the necessary skills (and not just the content knowledge) is to take FULL-LENGTH CATs under realistic conditions AND at regular intervals. It would help to know a bit more about 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) How have you scored on EACH of your CATs (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