HI Ancilla,
There are a variety of score combinations that will get you to a score of 600+ on the GMAT, so your score goal is reasonable. With the scores that you listed, you have the opportunity to pick up BIG points in BOTH the Quant and Verbal sections and you won't have to correctly answer any of the 'hard' questions to do so.
Before I can offer you any advice, I'd like to know a bit more about what you've done over the last 2 months and your goals:
1) Did you take a Course during the last 2 months or have you just been focusing on practice questions?
2) When you take your CATs, do you take the ENTIRE CAT (including the Essay and IR sections)?
3) Do you have to rush to finish any of the sections (and guess on a bunch of questions)?
4) When are you planning to take the GMAT?
5) When are you planning to apply to Business School?
Thankfully, the GMAT is a consistent, predictable Test, so you CAN train to score at a higher level.
GMAT assassins aren't born, they're made,
Rich