I'm sure you've done all that you can do. When the stakes are high, it's tough to see sometimes. Research shows that last minute cramming does little, if anything to increase grades on high-stakes exams. Research also suggests that what DOES help is also what makes you feel calm leading up to the exam. Going for a run, walk, bike ride, or anything else aerobic will help you feel calm and take your mind off things. It will also fuel your brain. Get a good nights rest, eat nutritious meals up until the exam and then start your celebration by rewarding yourself with a very unhealthy meal and some well-deserved rest after and then let the celebration begin! Best of luck!