Well I kind of crammed in my review lol I know I should have started reviewing earlier but I procrastinated and did it all at the last minute.
But I don't think anyone takes the pcat without taking the basics (gen chem, having some math, orgo 1, bio) so you really don't have to teach yourself anything. I think the only thing people might teach themselves is orgo (which is doable) and maybe some of the anatomy/physiology part of the bio section (which is harder).