In early March, I decided to pursue an MBA. Scoured the WWW and zeroed in on MGMAT. Took the in-class courses (a combination of teachers/classes due to my business travel). They were of great help! Apart from utilizing the resources mentioned in several posts, I would suggest keeping the following in mind as you prepare for the exam. Of course, I have paraphrased what the various instructors constantly mention during class.
Quant Section:
1. Take the time to understand the question. Work with what is given to determine what the actual question is.
2. For DS problems: Don't try to solve the equation. Especially for 700+ questions. Stop working on the problem if you can answer the question (Y/N/M etc). IMO, this realization is singularly responsible for helping me crack the 750 barrier.
Verbal Section:
1. CR / RC: Dont make any assumptions. Try narrowing the choices to 2 or 3, never 1.
2. SC: Always look for idioms, they help you quickly knock down the incorrect ones.
General:
1. Make up for lost time in the middle, not at the end!
2. Overall, during the actual exam, stay calm.
During the actual test, I had 2 mins to answer the final math question. I got to the right answer but the clock ran out! Didn't panic. Took a few mins to regain composure and did my level best to focus on the verbal section instead of getting distracted by my earlier goof-up.
3. The MGMAT CAT questions are more difficult than those in the actual test. So keep this in mind.
4. Dont be a test taking machine! And take the actual test within the first 2-3 months of completing the course.
My scores:
MGMAT CAT 1 (Mar 16): 550 (V: 29; Q: 37) - I took this exam while watching sports on TV. Dont recommend it :)
MGMAT CAT 2 (Apr 12): 660 (V: 36; Q: 44)
GMAT PT1: (May 10): 710 (V:40; Q: 47)
Actual CAT (May 14): 750 (V: 44; Q: 49).
All the best!