The test is not scored based upon percentage correct, and that figure may or may not tell you what your weaknesses are, so the first thing to learn is how the scoring actually works and how to interpret the data. :)
First, read these two articles:
https://www.manhattangmat.com/blog/2013 ... lly-tests/http://www.manhattangmat.com/blog/2013/ ... -the-gmat/Think about how what you've been doing does and doesn't match up with that and how you may need to change your approach accordingly.
Then, use the below to analyze your most recent MGMAT CATs (this should take you a minimum of 1 hour):
http://tinyurl.com/analyzeyourcatsBased on all of that, figure out your strengths and weaknesses as well as any ideas you have for what you think you should do. 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!)
Also do tell us what study materials you have available!
You can use the below resources to help study for CR and RC, but please don't skip the analysis step above. You may not be as weak in these areas as you think you are (and there may be other areas that are more problematic than you realize).
RC:
https://www.manhattangmat.com/blog/2013 ... rehension/CR:
https://www.manhattangmat.com/blog/inde ... reasoning/