If you are not yet where you want to be in terms of preparation, you could do another CAT two days before the exam. Especially considering that you are taking today (Sunday) off entirely. I have had students take a practice exam the day before the test and learn something extremely valuable about their strategy, timing, etc. that really transformed what they did on test day and allowed them to score significantly higher.

I would suggest that if you do choose to take an exam that you revisit the VERBAL (at least) of GMATPrep test 1, which you have not taken in a few months. I would not do any exam other than the GMATPrep so close to the test. Unofficial exams will not give you the sort of feedback that you require. And yes, you can take the entire exam (with AWA) and recover by Wednesday.

Your verbal score is not near your quant score at this point, and unfortunately the verbal counts for more as you get into the higher scores. A couple of questions more right on the verbal could mean moving from 690 to 710. Personally I would never want to go into a test with Sunday, Monday, Tuesday all off or just light work. But that is me - you have to decide what is right for you.

If you do take an exam tomorrow, what are you looking for besides the score?

1) Your timing strategy - are you devoting too much time to particular quant questions? Are you rushing through the verbal and making careless assumptions?

2) Are you making silly errors? These can be addressed, even in the course of just 48 hours. It is not ideal to have so little time, but better than missing lots of questions on test day that you did not have to.

If you do take an exam and you have some result that you need advice on, let me know...it is never too late to learn something valuable and increase your score.

Good Luck!