cdbebeau hit the nail on the head.
I wrote note cards for the chem and bio questions I missed and reviewed them as much as I could. I got tired of doing it for bio because there are a ton in destroyer, so I started typing up everything in the answer section and reading over that.
My plan was to be able to at least recognize what they asked. There's so much material, bio especially, you're better off making a few educated guesses on some problems than focus on specific stuff and have no clue on other questions. That's how I did it, you may find success doing something else. Find what works for you and go with that.
Best advice anyone could give you is to stay relaxed, if you worry you waste precious time. good luck!