You don't need a prep course for the PCAT. It isn't that hard. Buy a study guide, like Barron's. Barron's sample tests are in the same format as the PCAT, so you can get familiar with how the test is laid out. I found that to be a stress reliever.
As for studying, don't study for the verbal section. It is purely an IQ test. Don't study for reading comprehension, either you understand what you've just read, or you don't. There isn't any way to study for something like that.
The math section has a lot of log functions, basic algebra, and geometry. You need to learn some basic formulas and practice doing problems without a calculator.
The chemistry is almost all 1st year chemistry. Just review your text book. You'll need to be able to do dilutions, mass/mole conversions, gas law equations, radioactive decay, acid/base equilibrium, etc. There isn't a lot of organic. Just know your basic reactions: substitutions, eliminations, free radical halogenation, and of course you should know your functional groups.
The biology section has questions on cells, A&P, ecology, genetics, etc. If you have a good biology textbook like Campbell's, just review it and you should be fine.