Hi leinmad,
From your original post in this thread, it sounded as though you had taken several practice CATs - but based on your last message, you have taken just 1 CAT (and it was a month ago). As such, it's not clear what your current skills, strengths and weaknesses are. As such, you should take a NEW CAT sometime soon - and make sure to take it in a realistic fashion (take the FULL CAT - with the Essay and IR sections, take it away from your home, at the same time of day as when you'll take the Official GMAT, etc.). Once you have that score, you should report back here and we can discuss the results.
Assuming that your current ability level is in the high-300s or low-400s, then raising that type of Score to the point that you can consistently score 650+ will likely require at least another 3 months of consistent, guided study - and you'll have to make significant improvements to how you handle BOTH the Quant and Verbal sections. Thankfully, the GMAT is a consistent, predictable Exam, so you CAN train to score at a higher level. There's no harm in taking the GMAT as scheduled, but you will almost certainly have to retake it again later - so you can potentially save some money and aggravation by paying to reschedule your Official GMAT.
"Review" is an exceptionally important part of the GMAT training process; your ability to define WHY you're getting questions wrong is essential to defining the areas that you need to work on (and the specific things that you need to 'fix'). As such, I'd like to know a bit more about your last CAT. While a full Mistake Tracker would provide a lot more information, there are some basic questions that you should be able to answer (and the more EXACT you can be with your answers, the better):
After reviewing each section of this recent 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?
GMAT assassins aren't born, they're made,
Rich