This problem is common among test takers. After a certain stage, the score stops improving irrespective of the number of hours put into studying. I faced the same problem before my second GMAT attempt.
Fortunately, there's a solution.
The best way to improve is to strengthen your weak areas. You can do this by the following method of study:
1. Spot three SPECIFIC areas which you are least comfortable with e.g. Geometry, Mixtures, Speed-Time etc.
2. Spend a week studying ONLY those areas and nothing else.
1. Spot the question format which you are least comfortable with e.g. SC or CR or RC
2. Study only that area for one week and nothing else. While studying, you can focus on sub-topics within the question format e.g. If you're studying SC, focus on Subject-Verb Agreement and Parallelism. If you're studying CR, focus on a specific question type such as Weaken, Strengthen or Mainpoint.
Do this for the coming week and write a prep-test. I'm sure your score will improve
I've tried this approach and it works. So I believe that you too will benefit from this.
Also, doing many problems will not help. The key is to learn as much as you can from every single problem that you do. I spend as much as 15 minutes on a single problem to learn as much as I can from it.
You will also find these articles very helpful:http://www.manhattangmat.com/articles/e ... -part1.cfmhttp://www.manhattangmat.com/articles/e ... -part2.cfmhttp://www.manhattangmat.com/articles/error-log.cfmhttp://www.manhattangmat.com/articles/a ... eports.cfmhttp://www.manhattangmat.com/articles/two-week-prep.cfm
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From 650 to 710 to 750 - My Tryst With GMAT [Experience Thread]