Hi askul2389,
The scoring algorithm on the Official GMAT is far more complicated than most people realize (and score results are based on more than just the number of correct answers). Since that algorithm is proprietary, no GMAT company has an exact match for it, thus CAT scores can vary a bit based on the 'biases' involved in their respective designs.
Beyond that point, many Test Takers become overly focused on the 'implied level' of the questions that they're answering instead of the bigger issues - namely WHY they're getting questions wrong. To consistently score at a higher level, you'll need to make some adjustments to how you currently handle the GMAT. Before we can talk about how best to do that, 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 materials have you used?
3) How have you scored on each of your CATs (including the Quant and Verbal Scaled Scores)?
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