Hi evitacapitana,
Unfortunately, there's no way to 'translate' your performance on a Quiz to an actual GMAT Score. The only practical way to measure your progress during your studies is to take FULL-LENGTH CATs under 'test-like' conditions. That means that you have to take the ENTIRE CAT, away from your home, at the same time of day as your Official GMAT, without doing anything unrealistic (such as pausing the Test, eating/drinking while taking it, etc.).
From what you described, you've clearly put in some study time already. Before I can offer you any additional advice for your studies going forward, 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) What study materials have you used so far?
3) On what 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