Obviously it's hard to speculate what kind of questions you'll get. Honestly, if you have so many questions, you should buy a practice PCAT test from Pearson, it's going to answer so many of your questions to what the PCAT is really like. Obviously things like cell biology, anatomy, physiology, genetics etc take priority, but I'm pretty sure I remember a question or two on evolution and wouldn't rule out the other two. You've got a lot of time, aim to know it all!
Know the Kingdom, Phyla, Genus, etc etc. Also, know about "ancestry" in regards to that...like, how genetically similar two organisms would be based on their location in the diagram. I got some questions about plant structures.