There really should be a sticky post on this. Kaplan
's tests are notoriously hard and the scores are nowhere near what you're really capable of.
Don't keep taking those tests. Did you do all of the GMATPrep and Princeton Review
tests? Those are the best ones. Both are adaptive like the real thing. I don't know if Manhattan GMAT
tests are, but it would probably be more useful to do completely new tests that are adaptive than to redo tests you've already gone through. You'll be surprised at what you remember!