Is it the AB or the BC exam? Basically just relax. The written response is supposed to be fairly hard, and most of the questions there are split up into several parts. If you feel intimidated by a question and its first part, don't just skip to the next question. Read the question carefully and see if you can do any of it at all. Although the parts don't necessarily build on one another, you can probably get credit for assuming an answer to one part if it allows you to do another part.
Not really sure which one it is, but I'm actually thinking this test is going to be fun now. All I know is that it will have a multiple choice part we're not allowed to use calculators on, a multiple choice part we can use our calculators, and then six problems we have to show our work on.
Not sure if that helps at all, but I'm actually understanding the calculus much better after actually getting back into the swing of it (We hadn't differentiated since the end of 1st semester). I just need to get a 3 so I can skip Calculus in college