I will also say, at the risk of sounding unintentionally conceited, that I do not think the GRE is actually as hard as people make it out to be. I am convinced that a lot of the problems with peoples' scores are psychological. Prepping for the GRE, reading about other peoples' experiences with the GRE and spending too much time on SDN seeing what other people are getting on the GRE psyches you out into thinking it is harder than it is. It is not the MCAT. It isn't even a test of any particular body of knowledge, other than some high school algebra and geometry. The GRE is examining your test taking skills and your powers of logical reasoning. While it is definitely beneficial to memorize vocabulary words and math formulas for solving problems, and this is required to be able to answer some of the questions, most of the questions can be answered without actually knowing the answer if you have excellent test-taking skills. For example, out of the couple hundred vocabulary words I went through before the test, I think 1 or maybe 2 came up on test day. And maybe 20% (at best) of the math problem types and formulas I memorized came up. So needless to say prepping for the GRE via memorization has a very low reward to cost ratio.
The GRE is also a test of stamina, as having to write under pressure for an hour solid right at the beginning is very mentally taxing. I was fried by the time I got to the second math section, and that damaged my math score much more than not knowing how to do math did.
Take that sentiment with a grain of salt if you wish, but that has been my experience. Spending several sessions the length of the real test (4.5 hours) developing stamina and test-taking skills will help you more than attempting to memorize a "Top 400 GRE Vocab words" list and the method used to solve hundreds of math practice problems.
Also, studying for months and months is not going to help you. If you study for more than 10 or 12 weeks you will have either forgotten what you learned in the first few weeks by the time you get to the last few, or you will have just spent an inordinate amount of time making yourself believe the GRE is something that it is not. If you are intelligent enough to be going to PT school, then 2 months of an effective and efficient 8-10 hours a week or so of studying should be more than enough.
The gist of it is that you should definitely study the vocab list and definitely commit to memory the key math and geometry formulas you've forgotten since high school, but if I was you I would spend less of my time memorizing individual facts and definitions and more of my time learning and practicing problem solving strategies.
My 2 cents anyway...
