Almost everyone experiences some level of nervousness or tension before tests or other important events. A little nervousness can actually help motivate us. The first step is to distinguish between two types of anxiety. If your anxiety is a direct result of lack of preparation, consider it a normal, rational reaction. If you are adequately prepared but still panic or overreact, then your reaction is not rational.
Preparation can help Good test preparation is the best way to minimize rational anxiety.
With regular study, your test preparation will be simply a review of material already learned. Trying to master a semester's worth of material the day before the test is a poor way to learn and can create anxiety for almost anyone. Work first on mastering the main concepts that will be covered on the test. Break the information down into finer points once you thoroughly understand the main concepts. When studying for the test, ask yourself what questions may be asked.