What classes should be completed before taking the PCAT? Should Human A&P, Microbiology be taken before the PCAT, they are not even pre reqs for some Pharm schools.

I'd say a year of general Biology (including evolution, some exposure to genetics, ecology, some zoology and botany) and a year of A&P (lots of A&P questions) are the minimum for the biology section.

Don't forget a year each of gen- and o- chem. And math up to calculus I (there were no integration problems, just differentiation).