My assignments are worth 60% which I have got either A+ or A-'s on them however, I am not good at exams, my exam is 40% of my grade. What happens if I get a low mark or fail will I fail the entire course?
We aren't grading you your teacher is, ask your teacher.
Why haven't you gone to a therapist to solve your test taking problem? You have exvellent grades being brought down by your inability to test. Excellent grades get you excellent jobs.
There are relaxation techniques like EMDR (Google it, I've used it and it works takes 2 or 3 sessions), self-hypnosis, and deep breathing. A therapist can teach you.