1) The bell curve has two tails.
2) Unlike you, I followed a 'normal' academic career. I was graduated from High School at age 18 and from College, with BS in one of the physical sciences, at age 22 (Grad school followed a more unusual pattern). If this character is in his Senior year, he is at most 1 year behind.
I wonder if parents are still allowed to start their kids in school one year late? Here in Georgia, some parents used to do that so that they could be bigger and more developed for football.
"If this character is in his Senior year, he is at most 1 year behind."
No wonder he's the oldest student in high school.
He sounds like such a moron for having sex in the open, that I wouldn't be surprised to learn he was flunked at least once.
Wonder if he'll even pass a literacy test.