Have you taken a practice test yet? If not, take one *immediately* and make sure to take it under 100% official conditions. The results will tell you what you need to do going forward.
Read this (note: it's a 2-part article; read both halves):
http://www.manhattangmat.com/blog/index ... an-part-1/If you haven't taken any tests yet, just FYI that 1 month may not be enough time. It depends how far you are from your goal score - but if you haven't really done questions or tests yet, then you've approached this in a non-ideal way and may need more time to get yourself up to speed. I just want to warn you.
After you take your (MGMAT) practice CAT, use the below to analyze it:
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!)