Don't rely on his RC sections; they are pretty bad. You can use them for very easy practice, but if you want to do well on RC, you'll have better luck using the official practice PCAT tests.
Chemistry is probably the #1 thing you want to invest most of your study time into. Out of all the sections, chemistry has the most scaled points so it can make or break your composite. The Collins chem tests are sufficient prep to get you a good score.
For bio, I felt that it was more of a set of guidelines I had to study for. I basically went off of what I learned in my college classes.
I didn't really do much studying in VA because I didn't feel it would be time-efficient to memorize hundreds of words when only a handful of them would appear, at worst none, on test day.
QA is interesting because it requires you to know how to take a standardized test just as well as knowing the material. There were a lot of "pitfalls" that I could have fell into and waste precious time; you've got less than a minute for each problem so you have virtually no room for extra time. You'll have to work fast and efficiently to do well here.
