How to deal with declining grades in school?

My math average went down from a 96% to a 92% last report card, and I just got an 84% on my most recent test because I didn't see the last page. I'm really disappointed in myself because I feel like no matter how hard I try I'm going to inevitably mess up and keep getting worse. I'm super worried because university grade standards are skyrocketing and I just don't know if I'm going to be good enough anymore to do what I want... There is one more math test left and it's my only hope to regain my average, but if it doesn't go well I think I'm actually going to break down. Whenever I try to study for math I get really anxious and I can't concentrate because I can't deal with these thoughts and I don't know what to do :(
How to deal with declining grades in school?
Add Opinion