It's not that you weren't smart but you were certainly bored.
Sure, it was bad when you blew a spitball at your friend's head, missed, and hit your history teacher right between the eyes but that shouldn't have affected your grades.The only good part of your education, other than the joy you got from confronting the stuffy teachers, was the uniform. Now that you're free from those stuffy halls, we won't blame you if you want to keep wearing the uniform, maybe that will teach your school a lesson.