Hi dsr35,
Unfortunately, there's no practical way to 'translate' your performance on a set of practice questions into an equivalent GMAT Score. The only practical way to assess how you might Score on the Official GMAT is to take FULL-LENGTH CATs at regular intervals and under realistic conditions (re: taking the FULL CAT - with the Essay and IR sections, at the same time of day as when you'll take the Official GMAT, etc.). If you have not taken any CATs/mocks yet, then you can access 2 for free at
www.mba.com (and they come with some additional practice materials).
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) Have you used any other study materials besides the course that you listed? 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