I took the GRE psych test last year and got a 630, which got me almost 21 credits from Excelsior. I used the Kaplan study guide and a standard textbook on introductory psychology. I took a number of practice tests -two of which were from old GRE/psych tests that I purchased on Amazon - as well as the one that came with my GRE registration materials. The only one of those that was useful as far as I'm concerned, was the latter, from GRE. That's because the test was changed about a year or two ago, and most of the study materials out there don't prepare one for the new test. I had saved the GRE practice test for last, so that I'd be sharp for the actual test, but got a rude shock when I took it two days prior and did very poorly on it. Suffice to say, that you MUST know the concepts, as many of the questions are scenario-based. Memorizing a lot of names and dates will not get you a high score.