General Test Anxiety

In classes I makes A’s on almost every quiz, and homework assignments. I spend a lot of time studying, and know the material for what ever class I take. Sadly, whenever I take a test I get terrible anxiety, and end up doing poorly despite knowing the material, doing well on previous quizzes, and other things.

Currently I’m taking college Trigonometry during the summer semester; even though its a faster pace, I have this problem in classes in the fall and spring semesters as well.

Has anyone tried timing yourself on practice tests, and making the time limit a little shorter? Was it helpful? Any advice, tips, or tricks is appreciated!