Hi jessss,
Since it sounds like your Official GMAT Score is right in line with your CAT scores, you should do some analysis of your most recent CAT - with the goal of trying to define WHY you're getting questions wrong (and the more EXACT you can be with your answers, the better).
After reviewing each section of this CAT, how many questions did you get wrong....
1) Because of a silly/little mistake?
2) Because there was some math/verbal that you just could not remember how to do?
3) Because the question was too hard?
4) Because you were low on time and had to guess?
Based on your answers to these questions, we can figure out what you would need to work on to pick up the missing points that you're after.
GMAT assassins aren't born, they're made,
Rich