I'm sorry you're going through this.
My middle daughter has terrible test anxiety, and subsequently tests much lower than her capabilities. Despite that, her work on papers, her contributions in class and her working hard to overcome it have paid off. She's in Grad School right now, still anxious about tests, but still pursuing her dream to work in Library Science. She worked hard to get her BS in English, finishing last spring, and was accepted into a very good school for her MS.
It's hard when tests freak you out. I don't really have any pointers, I wish I did. I'm one of those weird nerds who looked forward to tests and get "into the Zone" immediately and actually tests with high scores most of the time.
But, I can see my daughter's fear every time she has to take an exam.
Making sure she has a good breakfast, a good night's sleep and stays hydrated (in addition to studying, of course) seems to help a lot.
I just kept letting her know, "Once college is over, those grades really don't matter much, your work does. And, your work is always well done." You only have one more semester, you can DO IT!