Are you being forced to guess on a bunch because you're running out of time? My guess is that you have at least some timing problem if you feel that you're guessing a ton. (Note: EVERYbody has to guess on about 4-7 questions per section, though!)
Use the below article to analyze your most recent MGMAT test, then come back here and share your analysis (your actual analysis, not just the raw data!):
http://www.manhattangmat.com/blog/index ... ice-tests/We'll then help you figure out where you need to work to improve.
If you do have any timing problems, read this article and start doing what it says ASAP:
http://www.manhattangmat.com/blog/index ... anagement/