If anybody understands what its like to be stressed because of school its me. I have been completely swamped with homework since day one of college. After spending hours and hours of my time looking into how to not want to explode, I have personally only found a few things to be successful but I hope it helps.
1) Take an hour a day to exercise, even if its just going for a walk. This definitely works for me because it clears my head and allows me to relax. Especially for days when I have to do homework ALL DAMN DAY, this gives me a proactive break. When you exercise, your body releases endorphins. These endorphins interact with the receptors in your brain that reduce your perception of pain. Endorphins also trigger a positive feeling in the body, similar to that of morphine. So if you exercise, it will make you happier and release stress when you're feeling overwhelmed.
2) If you're in college, go onto "Rate My Professor" before classes start to see exactly what other students think of your potential professor. Whenever I don't check, I always get stuck with an asshole of a teacher that assigns an absurd amount of homework.
3) Only procrastinate when its worth it. By it being worth it, I mean like if you're thinking you're gonna snap, take a day off of doing homework completely. But only do this if you know that you can finish all your homework before its due. Don't procrastinate by watching TV all day when you know you have a 10 page paper due in 2 hours.
4) Talk to your counselor. Sometimes letting out how you feel to an educator helps.
5) Email your teacher. One time I emailed my calculus teacher about how the amount of homework he expects us to do is insane, and he actually cut the assignment. Sometimes teachers don't want their students to feel like they're drowning in homework.
6) Please please please don't let yourself fall behind because you're confused. If you feel like you're not understanding the material, go into the teacher's office hours ASAP. In my physics class, I was very confused with vectors. I got completely in my head. I was distracted. I couldn't focus. I couldn't sleep. The only thing I could think of was how stupid I was because I couldn't understand. I let myself live like that for 3 weeks before I finally sucked it up, and I got help by my teacher. I wish I could have realized I needed help sooner.
7) Find other people who are struggling too so that you can all support each other being in similar situations (Which is why I'm on here)
I hope that this helps a bit, and if you were a struggling student but came out of it, post what you did here if I didn't mention it already :)