You haven't mentioned anything outside of school, so have you considered giving him something on the side? I would extrapolate that he's very frustrated he und

You haven't mentioned anything outside of school, so have you considered giving him something on the side? I would extrapolate that he's very frustrated he understands something faster than the others, regardless of whether it's a few grades beyond him or not. It's ok for school to be a certain speed. Some hobbies have infinite depth, and aren't inherently limited by the pace of school and the routine of school days. Examples include: games such as Chess / Tetris / Go, literature, learning finance, making things (woodwork, electronics...).