That's a very short timeframe for
anyone to study for the GMAT - and it's particularly short for a 200-point improvement. You may need to give yourself more time. Most people study for a minimum of 2-3 months.
First, it's important to know what the GMAT is all about. Read this:
https://www.manhattangmat.com/blog/inde ... lly-tests/Next, have you decided yet whether you want to work on your own or take a class? That's really the first decision to make.
If you take a class, you'll be given a syllabus, materials, and homework assignments.
If you work on your own, you'll have to decide what materials to use and set up your own study program. This article can help you with that:
http://www.manhattangmat.com/blog/index ... an-part-1/(Make sure to read both halves!)
After you have done the above and decided what materials you're going to use and how you're going to study, you can use the below to analyze your most recent MGMAT CAT(s):
http://www.manhattangmat.com/blog/index ... ice-tests/Figure out what you think you should do based on that analysis and all of the other materials you've read. Then come back here and tell us; we'll tell you whether we agree and advise you further. (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!)