How do I get over my fear of failure

I recently took a big exam in school, and we have four big exams and a final at the end. The four exams are the only grades that count, and Ive never been a good test taker. I failed the first exam due to my own lack of preparedness and now Ive taken the third and I feel like I did poor on that one meaning I would have failed two exams which is the max you can fail and im worried my grade will be unable to recover. Im so scared of failing this class as its kind of the one-way ticket into my field. theres other programs I can get into but then I leave everyone in this class and im sure theyll speculate and now my graduation will be delayed as well. I'm so terrified of failing every little thing and I can't get over it. Does anyone have any advice of how to manage the feeling and get over the way I feel because I can't stop crying or freaking out over the fear of failing this class.