How did you do in your Pre-Req classes? Honestly if you have taken them recently and retained at least the important stuff then you really don't need to study much at all. I've taken my pre-reqs spread over the last 8 years and didn't even have Bio II or ANY Organic Chem before I took it in August. Not too mention I'm like the worst studier in history so maybe put like a TOTAL of 8-10 hours going back and refreshing my memory, and still somehow managed a 72 composite. So if you have had your pre-reqs recently and with all of that studying you should be perfectly fine. So definitely just try to relax because if you're too stressed out then that might be the thing that kills you. One big thing about the PCAT is that it tests your ability to work under pressure.