Got all my exams out of the way already.
One thing I can say: don't let your nerves weigh you down. When I began one of my finals, I felt extremely nervous. So instead of just doing the test in order, I skipped to the most familiar-looking problem. After completing it, I managed to give myself a momentum boost and the rest started to piece together for me. Don't rush into the exam and don't approach it thinking you have to go in order; let your brain wake up and then start crunching the numbers.
Can't really say much else.
Best wishes to those still working on exams! :ok: