Hi April,
You sound like me a year ago!
I would suggest utilizing your public library. I checked out a lot of AP books for Bio and Chem (I couldn't find one for Phys) and also checked out high school science books. I wasn't a science major and so those high school books really helped me get a strong foundation pior to tackling the AP books. Doing the AP questions can be discouraging but it will help. Keep in mind, however, that the AP questions are MUCH harder and specific than the OAT questions. I looked at an MCAT book but the MCAT is a totally different beast than the OAT. Like others on this forum have suggested, I also checked out a DAT books. The Kaplan DAT book was the most useful (disregard the perceptual ability section).
Some other disposable comments:
BIO:
I thought this was the hardest section on the actual OAT. It could be because it's been over 5 years since I took it in college... Nonethless, you have to get down and dirty and study the details.
PHY:
Study the topics that are on the practice OAT--it's provided by the same company that you sign up with for the actual OAT. If you study those topics, you're bound to get atleast a 330. I studied a lot of topics that wasn't on the practice test and it also wasn't on the actual exam. Don't be intimidated by it.... (I was scared to death to tackle this section!)
Chem:
Gosh, where do I begin? I suggest studying for math first. This way, you brush up on your arithmetic and you get used to not using your calculator. Other than that, the Topscore CD really helped (the Topscore CD was the only thing I spent money on to study for the OAT).
Orgo:
I suggest browsing through the Kaplan DAT book to get a feel for the topics. Don't bother studying all the specifics. Trust me on this. Group the reactions together and forget out all the mechanisms. If you make good notes (make sure the topics are organized) and look at it periodically. Looking at the topics over and over again will really help.
Math:
If I recall correctly, this is the section that you can miss the most and still get a decent score. For instance, you can get around 15 wrong and still get a 350. I think.... If you look at the scoring chart, you'll get what I mean. I suggest utilizing this section to raise your total OAT score because the math is very basic. The time, however, is probably your biggest enemy. You might want to study the hard questions on the SAT (I believe Qs 24/25 are the toughest on the SAT).
Reading Comp:
Well, any of my comments on this section might be misleading cause I was a liberal arts major. If you did well on the RC on your SAT, you shouldn't worry. Despite my background, I lucked out on the actual exam b/c I attended a seminar that was given my the person whose experiment was the focus of the third reading passage.
Like so many other things in life, if you put in your dues, you'll go fine. Don't underestimate the exam but don't stress too much. Good luck, April. Also, if you want explanations, pm me. 🙂
Also, if you want to buy my Topscore Cd, pm me. You have to use the Cd within a certain time, but don't worry about that. If you're interested, I'll let you know when you pm me.