As others have said, not sure how much time you have before you take it, what your background is (how much school you've had, if you're currently a student or going "back" to school, etc.).
If you haven't started studying at all, I would recommend doing a practice exam to gauge your strengths and weaknesses. The sections where you do great, don't spend as much time studying for those - the ones where you do poorly, focus on studying for those.
I don't remember which books I used - it was too long ago - but since I had been out of college for about 10 years when I took the PCAT, I had to study math and chemistry a LOT but didn't spend much time studying for the other sections. A lot of it is going to depend on your background and your personal strengths and weaknesses.
I think taking practice exams is a good way to familiarize yourself with the types of questions (and as I said before, to identify areas you need to work on), but I don't think using them alone is enough (unless you are already totally awesome in every area of the exam!).
I also worked full time while I was preparing for the PCAT - I didn't take any vacation time, but here is what I DID do:
1) Practice exam - decided I needed to really study chemistry and math and brush up on biology - decided not to worry about RC or Verbal because I did well in those sections
2) Made a study plan - spent about 1-2 hours a night about 5 nights a week reviewing the sections I had decided on. I started studying about 6 weeks before taking the exam.
3) Took another practice test to check my progress
4) After hitting bio, chem, and math hard, I did a brief review of the RC and verbal sections just to feel good about it.
5) Did a couple more practice exams to feel comfortable with the time restraints and question formats.
6) Took the PCAT
Just remember, you won't be able to study and/or memorize everything - so try to hit the high points and draw on the knowledge you already have from school. Good luck!