Why am not excellent in my school?

I know nothing about you, but I know about schools: They were terrible sixty years ago and they have only gotten worse since then.

If you think you need classes, take them at the community college. That is a different world just because everybody there is grown up. Take acting classes. There are two things the world demands of you: one is that you act some certain way, the other is that you talk well. So take acting classes and concentrate on vocal skills. Also take a civics class and a personal finance class.