Bad Test Taker

When it comes to taking tests I am horrible. I can study for hours and hours but when it comes to the actual time to take the test I forget everything that I spent time studying. That is one of the problems I am having with one of my classes in college. I am scared that I am going to fail the class, because are overall grade is made up of the 4 tests that we take in the class. We don't get any other grades but those 4 test scores. As I mentioned before I am a horrible test taker. I hope that I can continue to study hard and make better scores on my test, and hopefully get a decent grade in the class.