Test anxiety

I have an overwhelming case of test anxiety. I recently signed up to take my exam and I wanted to throw up while paying for it. I’m averaging in the 70s - sometimes 80s on Uworld. I took a practice exam and it gave me a “very high chance “ of passing .. but I’m still super nervous. I’ve failed twice but I didn’t study as much as I did this go around. I’m at the point of “whatever I don’t know, I don’t know. What’s important is I know MOST of the material “

I know this is an important exam so a lot of people get anxiety but I’m wondering if anyone has advice on how to cope during the exam. I’m scared I’m going to get in there and the fear will overcome me 😭😭