My advice:
Study test prep books of not just Pharmacy, but for other healthcare fields. Make sure you go over the questions in the books a lot. Do not mark in the book, use loose paper. Make sure to give yourself a very small time limit to complete sections. For those that have taken it, you know the sections are very fast.
Reading comp: practice underlining the main point sentences in the passages. This helps not only when you go to search for an answer, but it kinda engraves these sentences in your memory.Lots of Repeat Passages!
Vocab, just go over words from the books and roots in between the other sections when you are studying. Sort of like a "break" in between your studying the tougher sections.
Math, ehh...hopefully you are not like me and have taken calculus recently. I took calculus probably 6 yrs before i took the PCAT i completely forgot how to do it. I pretty much chalked calculus up on the PCAT. The amt of calc increased with each time i took the test. Just do the problems over and over. Correct me if im wrong other PCAT takers, but the geometry was a very small part of the test, from what i recall.
writing; If you aren't the best writer, don't worry. No need to practice this section if you are decent with sentence formulation.
Once you have taken the test once, try your best to remember the questions you know you got wrong...more than likely, you will see it on the next PCAT you take. With your Kaplan book with you, mark the topics that you saw on the PCAT. The PCAT professor i think was helpful. Between PCAT professor and my own studying, (never took any of those classes). I jumped 16 points from my first PCAT to my second. If my GPA was higher, my first score would have been enough. I still should have my PCAT professor account, if anyone is interested.