I made as good of grades as I wanted to. A average, until I got bored with school.
The only reason I graduated was because I got to see my girlfriend/fiance at school. She is now my wife of almost 20 years.
I mean, by the middle of first grade I had already read all the reading books through sixth grade. So most of school was very boring to me. Science was interesting, until I had covered the different principles. Math/algebra was good, until I had done them.
I dunno. Maybe it was just me. Even with me just goofing around the last three years of school, I still graduated 105th out of 580. but I made a 28 on the ACT, one try, on two hours of sleep.