I don't know if you're already at school or just about to go back, but here are some ways to stay alive/ survive in school.

1. Sleep! Go to bed at a reasonable time! Leave your phone downstairs if you think it will distract you and buy an actual alarm clock to wake you up.
2. Do your homework on the night you get it so you won't get swamped with work.
3. Don't overwork yourself. Don't sign up for a load of extra after school clubs which will mean you have zero time for yourself.
4. Wednesday is pamper day. Use a face mask, have a bath etc.
5. Try to avoid friendship drama, it will stress you out even more.
6. I don't know about American schools (I think someone told me that every test you do goes towards your final grade) but if you have like a small test that doesn't really mean anything, don't stress about it. Focus on the big tests which will actually determine your grade (again, I can only really speak as someone who attends a UK school).
7. Have fun with your friends! Listen to music at lunchtime in the classrooms (if you're allowed to). Sit outside if it's warm etc.
8. If you're parents are stressing you out and complaining about your grades just remind them that at least you're not in jail.
9. If you have a teacher who really hates you, study really hard so you do really well in their lesson. They may not like you, but at least they can't say you're not trying.
10. If you make an enemy, just remember that in a few years, that person will mean nothing to you.