Hi:
Perhaps I can help, I scored 86+ in those sections you mentioned, studied 3 days for it.
I made sure I knew the vocabulary given in the PCAT book. If you notice, the majority of the questions on the real exam is simliar to the ones given in the practice PCAT book the Psychological Corporation gave you.
I would recommend using kaplan or peterson PCAT prep book in the reading comprehension. You should read for comprehension, which will help you answer the questions easier.
As for math, it is basic practice. Do all the problems in the PCAT book as well as the other books mentioned above.
For the analogy part, if there was a word I did not know, I'd break up the word into pieces to see if there was a word I undrestood in that word. One of the tips given was to look at the beginning and ending of the word. If you took latin, it would help you a lot in understanding what those words meant.
The peterson book gives great tips in the verbal department.
The biology is pretty much straight forward memorization.
Good Luck.