IMO, the chem questions in the Kaplan book are a lot harder than the ones on the PCAT. There was lots of o-chem Qs on the Kaplan book but from my experience the PCAT doesn't have many o-chem questions. I would say concentrate your studying efforts on gen chem. As for the math, practice doing simple math problems with speed being the primary concern. The PCAT math section is loaded with easy questions but it's very long. Most test takers don't finish the section.