So I got a 96 on the PCAT with a 4 on the essay. 99 for bio and 97 for chemistry. I only used Kaplan and my textbooks. I took the first of the free online Kaplan exams that come with the prep book to see where I was at. I got an 84 I believe. I then reviewed the questions I got wrong (and some that I guessed and got right). I went back to my textbooks and to Khan Academy and the prep book of course to review those topics, doing extra practice problems. About two weeks before the actual PCAT I took the last of the two exams. I got something really ****ty like a 62 or something. I started to get paranoid (I think I got a 32(!!!) in chemistry on it!), so I sat down and reviewed way more than I really needed to.
I would say that Kaplan's biology and chemistry sections were MUCH more specific and difficult than the PCAT. My chem section on the PCAT didn't have nearly as much math. It was mainly concepts (electronegativity, pKa in relation to deprotonation, etc.) and orgo. The bio section for Kaplan was way too specific with bacteria, diseases, and the endocrine system. My PCAT had questions about these things, but they were pretty darn obvious (i.e. "how does penicillin work? answer: inhibits cell wall synthesis in bacteria") if you've paid attention in your classes. The math section, however, is where I saw a bigger discrepancy (reading and verbal were close I'd say, maybe reading being easier with Kaplan because the passages seemed a little shorter). Kaplan had a lot of stuff on basic arithmetic and limits. My PCAT did have limits and arithmetic, but it had more calculus. This was actually fantastic for me since I am so much better at calc than I am at math that I haven't taken in over 6 years. LEARN HOW TO MANIPULATE VECTORS. Dear God I can't say that enough. I hadn't touched vector math since physics 2 and my calculus classes. I forgot all about them, and most definitely got those questions wrong on my exam. I still did okay in quant (I forget my score...somewhere in the 70s? Check my post history), but I know I could have done better if I reviewed some of those math problems more. And speed. Speed will be your biggest issue. Most of the questions were pretty easy, but you don't have enough time to solve them in full. Lot of fraction and decimal manipulation that can easily eat up your time.