My suggestion: 1. take prep 3 test.
2. Analyze performance. Revisit concepts in MGMAT book
3. Take a manhattan test.
4. Analyze performance. Finish problems in question pack 1. In the interest of time, only do the medium and hard questions. Go thru explanations of each question, esp CR and SC.
5. Take prep 4 exam.
I assume that u have not used the above resources. If you have, id still retake prep 3 and prep 4.