Hi Daniel,
From what you've described, it sounds like you've gotten 'stuck' studying in this way, so you should STOP taking practice CATs and focus more on review (at least in the short term). By defining whatever areas are causing you problems, you can focus your studies, train properly and improve.
Here are some things to look for on your last CAT:
1) Did you have trouble finishing any of the sections on time (and did you have to guess on questions just to finish)?
2) How many questions did you get wrong because of a silly/little mistake?
3) How many Verbal questions did you 'narrow down to 2 choices' but still get wrong?
You did not mention it in your post, but what is your score goal?
When are you planning to apply to Business School?
Do you know what Schools you plan to apply to?
GMAT assassins aren't born, they're made,
Rich