bio: ridiculous... there were questions from left field, right field, and center field. Spend all your free time reading biology/physiology textbooks.
g-chem: I found it very easy. go through Kaplan, do practice problems on stoichiometry, gas laws, redox, etc.
I made flash cards to supplement Kaplan's. I put all kinds of gen chem laws, bio factoids, functional groups and other stuff on there and would go through them while watching TV, before sleeping, brushing teeth and so on. I think it helped and kept my mind on it even when I was taking a break from studying.
lovechild, good luck!