I took the GMAT in the fall.
Kaplan's book helped.
The strategies were good, but the best thing was the CD that came with it and the 4 full length practice tests that you take on the computer, which is what the real thing is.
That takes getting use to. For example, the pacing is crucial, since you can't go back to an earlier part in the section. Even if you have 20 minutes leftover, you can't go back to the earlier part of the section. That's the tough part of the test. It's fast. Unlike the MCAT, everybody would get a perfect if this was taken without a time limit, but it is much harder in terms of time constraints than the MCAT.