You're making good progress!
In order for us to give you good advice, we need to know more about your strengths and weaknesses. Use the following article to analyze your most recent MGMAT test, then come back here and summarize your analysis. We'll help you figure out what to do!
http://www.beatthegmat.com/a/2009/09/23 ... tice-testsYou may also want to read the following article, which describes how to study a practice problem. The analysis described in the article is the primary way in which you improve; if you have mostly been doing problems but not spending much time analyzing them (including the ones you get right!), then you aren't learning as much as you could be learning.
http://www.beatthegmat.com/a/2009/10/09 ... ce-problemYou can start to use the above analysis right away, while you wait for us to reply to your next post about your practice test. :)