Hi Juan,
GMAC has publicly stated that the Official Score that you earn on Test Day is within +/- 30 points of actual ability. Assuming a similar 'swing' in how your CATs function, your CAT score results - along with your Official Score - show that you essentially performed the same each time (about 620 +/- a few points). You handle certain aspects of the GMAT consistently well, but you also make certain consistent mistakes.
If you cancelled your recent Official Score, then you can always pay to 'reinstate' it later on (and that same option applies for any other GMAT that you take). 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) 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 apply to Business School and what Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich