How do you cope with stress, worrying about the future, anxiety and overthinking?

Salamu alaikum, it’s exam period and I failed one of my tests that I will have to retake in 4 months. How do I cope with all the worrying? I know FOR SURE that if I feel really stressed in my upcoming tests that I will just not make it.

I constantly think about it while studying for the other exams. Any words of wisdom? I don’t want to let my parents down. Jazakallah khairan

(It’s hard to go back to sleep after fajr because of the overthinking)