I'm sorry I wasn't able to get to your post before your test. What I would have said: if your current scoring level is very far from what you hope to get on the test, then you need to change your test date. There's really nothing anyone can do in 5 days to improve a score in any substantial way.
I assume by now you've either taken your exam or possibly you did postpone it. If you'd like to get more detailed advice about what to do from here, then we need more detailed data on your strengths and weaknesses in order to advise you. Use the below to analyze your most recent MGMAT CAT(s):
http://www.manhattangmat.com/blog/index ... ice-tests/Then come back here and tell us the results of your analysis and what you think you should do based on that analysis. (Note: do share an analysis with us, not just the raw data. Part of getting better is developing your ability to analyze your results - figure out what they mean and what you think you should do about them!)