this is quite general! what do you hate about school? Is the learning too hard, or are you just a lazy student? Are your teachers unfair, or are you talking alot in class?
You need to sepearate between your own actions and what is actualy a problem with the school!
if you are struggling with grades but you are trying really hard, then i’d suggest getting a tutor, or maybe if your in hgih school dropping a hard course.