When my sin was in 8th grade he was taking Calculus at the high school. In HS he was taking advanced math at Harvy Mud College. 20+ years ago. They don’t do that kind of stuff anymore at California schools.
Damn, son! When I took Calculus in 12th Grade, it seemed to be one big stumble of C’s and D’s, until I spent winter break doing lots of extra problems on my own. Then I got the hang of it.
For your son to do something like that in 8th Grade screams, “Put this guy in charge of . . . well . . . EVERYTHING!” Congratulations!