Test yourself at regular intervals to determine if you truly know and understand the material.
Get adequate exercise, nutrition and rest, especially before exams.
Identify and remove sources of anxiety.
When you first receive your exam, look over it quickly to get a feel for the questions. Read directions carefully.
Use a system to quickly categorize questions into those you know well, those you know something about, and those you know little about.
Start with the questions you know well.
Underline key terms and information.
Work at a reasonable pace, even if you don't complete the exam.
Use all the exam time allotted.
Check over your exam to be sure that you answered all questions, that your calculations are correct and that your answers line up with the answer sheet/Scantron.
Change answers only if you are sure of the change.
If you are so nervous that you blank out on exams or have intense physical symptoms, see Managing Exam Anxiety. It is also advised that you see a counsellor at Student Counselling.