Hi debbiem,
If your Test is in 3 days, then it might be tempting to try to 'cram', but you shouldn't do that. You also should NOT take any FULL-LENGTH CATs either. A bit of light review is fine, but you'll be better served by going into the GMAT well-rested. When you have your score results, you should post back here.
Two of the great aspects of the current version of the GMAT is that you can always cancel your score if you're not happy with it AND you can always retest in as little as 16 days after taking the Test. So even if you have a bad day, you can get back in and retest relatively soon, if needed.
GMAT assassins aren't born, they're made,
Rich