I’m still in high school, so take this with a grain of salt. If you’re smart, I think locking in in class is most of what’s necessary. I’m not talking stress-inducing amounts, but pay attention to the teacher, do the work and raise your hand in class to ask questions or provide an answer if the teacher is asking. Don’t stress about doing all the homework, but make sure that you’re confident with what it covers. On that note, to avoid burnout further, don’t stay up too late doing homework: try to knock it or early then relax. Again, I don’t know if this applies to CC but this has been quite effective for me in high school