The best way to ensure that you have all of your necessary prepharmacy classes it to go to the website of some of the pharmacy schools that you are considering and see what classes they require. The standard classes tend to be 2 semesters of biology, 2 semesters of general chemistry with the labs (one of which is a qualitative analasis lab), 2 semesters of organic chemistry with labs and the normal english and math requirements. Some schools also require economics classes and public speaking so, check with the program requirements. About the PCAT…. you want to take it after you have taken all of your biology and chemistry classes but, keep the application deadlines in mind. The earlier you get your application in the better so, I would recomend the summer PCAT over the other dates as long as you are ready. Another good tip is to buy some practice exam books for the PCAT and test yourself before you take it … it really helps. Good luck with the pre-pharm.