Use Dr. Collins study guide and you can easily get 90+ comp studying for about 1-2 months a couple of hrs a day. Or if you super hardcore, 2 weeks or so about 6-8 hrs a day.
Honestly, most of the PCAT stuff is general questions from your undergrad science courses and Calc I and stats classes. There are a lot of human anatomy questions, but the Dr. Collins biology guide goes over the information very thoroughly and you should have no problem getting a 90+ if you understand the material in the packet.
You really do not need the biochemistry class to do well on the chemistry part. There is very little questions regarding biochem and it is VERY generalized and easy (the Dr. Collins guide only has like 1-2 pages of biochem and it's very basic stuff from general biology lol...) What you need to focus on are chemical equations from o chem (Sn1, Sn2, E1, E2, hydroxylation, etc.)
The English part personally for me was hard. The Dr. Collins vocabulary was USELESS~! None of his vocab words were on the PCAT and I had the newest update. I would recommend getting a GRE study book and study the top 200 vocab words from that. Also, practice writing essays (strong intro and conclusions and writing persuasion style essays).