I would call and speak with his guidance counselor. He might be bored, which isn't necessarily a good way to get good grades. Depending on where he is in the school year maybe he can test out of geometry and go straight to the next class.
My son is bored in geometry and his teacher gives him extra work to keep him on track. My son decided against the testing out option because he felt that he knew 90% of the geometry, but was so hot on actually doing the proofs (which are now boring) and circles were new. He is just biding his time until calculus, where he might learn something he hasn't taught himself from Khahn Academy.
at 11:27 PM on Oct. 3, 2012