I'm not the OP, but I got a 96 composite (68 VA, 99 Bio, 86 Reading, 77 Quant, 97 Chem).
I used my Kaplan book and took the exams. First one I took was kind of my diagnostic, and from there I focused on what I didn't know. I clearly had forgotten about radioactivity, the gas laws, and some of the more basic things like the percent of some isotope making up the total mass presented on the periodic table. For math, I did practice problems I found online and used my old calculus textbook. I also watched some Khan Academy videos for anything I was unsure of (i.e. some organic chemistry and calculus laws/rules you never use past the first week of class). As for reading and verbal, I didn't put much effort into working on those. I figured that whatever I have for vocab now is all that I'll have. I read news articles, but that's nothing different than what I do every day anyway. Thinking back, I wish that I spent more time reviewing math from before calculus. There were a lot of problems on my exam pertaining to statistics and vectors. Also a lot of fraction and decimal manipulation which was difficult to do when I was only allotting something like 30 seconds per question.
My biggest tip to you is to really learn your coursework as you go through it, and try to get fast at quantitative. Also triage your questions. I flagged all of the passages for bio and chem and saved them for the end.
Take a deep breath, don't doubt yourself too much, you'll be fine. I thought that I failed the exam and was really nervous to go to the guy at the front desk and get my printed results. He handed it to me with a smile and told me I did well. I was the awkward girl actually making conversation with people in elevators because I was so proud at how I did. I really truly thought that my quantitative section ripped me a new one. Goes to show that you're probably going to do a whole lot better than you think.
