You have a little over 2 months to study so I say you have a great chance of getting in as much info as possible before your PCAT exam in Aug. This is what you should expect to be studying:
Genetics (hardy-weinberg equilibrium, evolution theories, pedigree charts, know how to do test-cross basically Mendelian concepts, Symbiosis)--this is sort of combined with the general biology section: maybe like 2 or 3 questions on it
Microbiology ~20% (virus: its structure & components, bacteria: structure & components & its reproduction processes, differentiate between prokaryotes & eukaryotes, fungi, differentiate between types of bacteria (cocci, spirilla, etc.), some idea of common diseases associated with deficiency in nutrients like for ex: Iron deficiency causes anemia, etc.)
Gen. Biology ~60% (cellular respiration: Glycolysis, Kreb Cycle, , genes: DNA replication, transciption, translation, RNA & its function, mitosis, meiosis, diploid, haploid, different types of mutations, action potential, enzymes, general knowledge of taxonomy (there will probably be only 1 question on that), major structure of plants & its functions, cell biology: major structure & functions, types of diffusion, general knowledge of vertebrae embrylogy, photosynthesis
Human A&P ~20% (Nervous system: neurotransmitters, Na+/K+ pump & its function dealing with action potentials , endocrine system: where specific hormones produced, functions, major components of Digestive system, major components of excretory system and what it does, where & how the heart pumps oxygenated/deoxygenated blood to/away from the body, blood types (also references to genetics), different types of muscles and where it can be found, also anatomy & physiology of eyes & ear
I hope this is not too overwhelming for you but my suggestion is to not dwell on the subjects too much. The PCAT test your general knowledge of these subjects and does not go into too much detail. The more info that you can come across the better the chance of recognizing that you did go over something like it when taking the PCAT. Even if you have to guess, you will give the best educated guess.
I definately recommend Kaplan PCAT book for only Biology, I scored really high in that section and it's quite rather inexpensive. Also do lots of practice question.
GoodLuck to you!