Learn your material thoroughly.
Exercise is said to sharpen the mind.
Get a good night's sleep before the exam. View the exam as an opportunity to show how much you've studied and to receive a reward for the studying you have done. Stressful foods can include processed foods, artificial sweeteners, carbonated soft drinks, chocolate, eggs, fried foods, junk foods, pork, red meat, sugar, white flour products, foods containing preservatives or heavy spices, and chips and similar snack foods. Allow yourself plenty of time to arrive for class and study. Relax just before the exam.