The Biology proctored exam is open book. Knowing that helped ease my fear a bit.I haven't reached the discussion boards yet so I'm clueless there. As far as studying, I plan to look at study guide & text objectives and make sure I know the answers (or at least where to find things during the exam.) You could use the objectives as a practice exam. Try and answer each of the objectives without looking up the answer.
Hopefully something I've written will help.