Replying to School, important as people say?

So I know im on the younger side of people who use this site but I genuinely see very little point in school. It teaches me nothing for career paths im interested in, stresses me out. Makes my mom go insane at me. Im in 8th grade so I know theres not as many options for classes to teach about career stuff in. But im constantly being told that I need to perform well in classes I dont have a sliver of motivation for to even be eligable for the ones that I will care about and value. Like what is that!