Tacos

I know that feel. Just grit your teeth, prep for suffering, and endure.

Take the time to review (if you have ample time). Prioritize the first exams or the one you have most trouble with. Then skim your notes for the rest.

Try closing your eyes and forcing yourself to calm down while you're in that state (I don't care how you do it; I took deep breaths and sing to myself for a few seconds). Then proceed to look at your exam/notes again. It's a common habit I have done over the years and it saved me many times during finals and midterms.