According to the ADAA , causes of test anxiety may include a fear of failure, lack of adequate prep time, or bad experiences taking tests in the past. You’re not alone! Here’s what you can do to stay calm in the days leading up to and during your test.

Yes, this seems obvious, but it bears repeating. If you feel confident that you’ve prepped thoroughly, you’ll feel more confident walking into the test.


Cramming is never the answer, and pulling an all-nighter can exacerbate your nerves. Having adequate rest (9–10 hours per night) is likely to be more beneficial than rereading a text until dawn. 


Eat a nutritious breakfast before the test and pack smart snacks for ongoing energy. Look for foods that offer a steady stream of nutrients, rather than a sugar high followed by a crash.


Feeling rushed will only amp up the anxiety. Pack everything you need for the exam the night before and set the alarm, so you can get out the door on time.


Bring a picture of your happy place or come up with a morale-boosting mantra like “I can do this” or “I worked hard and deserve this.” Peek at your picture or recite your mantra, right before the test begins.


Everyone else is scribbling away? Ack! What do they know that you don’t? It doesn’t matter. Pay attention to your own test and pace, and forget about the other students in the room.


Deep breathing can slow down a beating heart or a racing mind, so practice these techniques at home. The very act of concentrating on breathing and thinking can biometrically alter those anxious feelings.
Sometimes just remembering that some  test-taking anxiety is a normal part of school can help make it easier to handle. 


Source: https://www.princetonreview.com/college-advice/test-anxiety