Did the school do a comprehensive evaluation for a possible IEP? Does he have a 504 plan? If not, that is needed. There may be undiagnosed learning disabilities. But even if there are not, he should still get interventions, modifications, and accommodations for the ADHD if it's affecting his work in school. The parents can put in a written request for an evaluation. If the school is incompetent (as ours was) it's also possible to get an outside educational eval with an educational psychologist or neuropsychologist.