In my opinion, the best way to prepare for the Bio, Chem, and Math (somewhat) portions of the PCAT is to pay attention in your college classes. My community college classes are at a higher level that PCAT questions... if you actually learn the material, then review your notes and maybe some sample tests before (which will all be review because you have already mastered the material in class), then you will do well. In addition, for the math portion, practice is needed in doing the questions in the time allowed, for which sample questions were useful (I only used Barrons book and Pearson practice tests, they seemed to cover most of the tricky SAT type math questions that are easy if you know the fast way to do them). All of the calculus on the PCAT was pretty basic.
The Verbal section is more a test of IQ, they are very similar to questions I have seen from Pearson for pre-employment test that Pearson runs for many companies on potential hires. I suppose memorizing words can help as well. Reading comp also seems more IQ geared than anything else but it appears the consensus around here is that if you are weak there reading peer reviewed science journal articles can help.
This is all my opinion and based solely on my experience with the October PCAT. I studied about 2 weeks only for math, bio, and chem and recieved a 97 composite with chem being my lowest section score at 81 %. There were about 7 or 8 questions on the chem section from Ochem that had material I had not learned yet as I was only about 5 chapters into Ochem I when I took the test, so I was happy with the 81 there though unhappy with how heavy on Ochem this test was versus practice tests and anecdotal info about other tests I had heard. I started taking all my prereqs since Jan. 2009 which was a huge help in terms of learning the material so recently before the test. Hope this helps...
