I'm wondering how the ADHD diagnosis was made, and if, as blackcat mentioned, there might be undiagnosed learning challenges leading to the behaviors that look like ADHD and that are causing frustration in the classroom.
So I'll second blackcat's questions - has he had a comprehensive eval, either by the school or by an educational psychologist or neuropsychologist? If not, I'd get him in to see either a neuropsych or ed psych asap. If his parents feel the school will provide a full evaluation that is reliable, then it's ok to start there.
Best wishes,
polarbear
