Hi m94m,
"Review" is an exceptionally important part of the GMAT training process - so you should plan to do a full review of each CAT that you take (with the goal of determining WHY you're getting questions wrong). While a full CAT Analyzer or Mistake Tracker would provide a lot more information, there are certain basic questions that you should be able to answer after reviewing each CAT (and the more exact you can be with your answers the better).
After reviewing each section of your last 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?
5) How many Verbal questions did you 'narrow down to 2 choices' but still get wrong?
Based on some of the goals that you mentioned in your prior posts, I have one additional question about your timeline/plan:
6) If you scored 640 in 3 weeks, would you be 'done' with the GMAT or would you continue studying?
GMAT assassins aren't born, they're made,
Rich