I know this probably comes a little too late/exam may already be passed. But I always think of the one key advice I received back in my undergrad, when I was studying at Oxford: you can only do SO much. After that, you have to let go and just do your best. I took that home with me, and even now. I appreciate the stress. But utilize that stress into something positive (focused studying, etc), then just let go and do your best.
Also, Test Taken 101 is that, after so much studying, there comes a point (right before the test) that any further study is counterproductive. Though I generally keep running notes until the very last moment, myself.*^^* So. Take that with a grain of salt.^^
Good luck!!