1. Develop a really great relationship with him like playing ball for an hour after school etc so he doesn't need to have problems to get your attention. Praise him when you see him doing something good!
2. Ask the school psychologist to give you the ADHD inventories and give one to the teachers, one to Mom and Dad, and Grandma, and babysitter etc.
3. Call a pediatric psychiatrist and make an appointment. Bring all the filled out ADHD forms to him.
4. If he suggests meds (Ritalin, etc) to test if he does good on that, then follow the Psychiatrists recommendations
5. You should see immediate results in school and from the teachers, including his anger management.
ADHD means someone has Attention difficulties, distractability, with hyperactivity, or without hyperactivity, and impulsivity. If he has difficulty at school and falls behind then the School Psychologist can test to see if He qualifies for Special help by giving him a Psycho-Educational Assessment. However a student who has ADHD is often hyper and the test is not always valid, so he has to qualify in another way too like low performance in school. If he has 2 deviations in 2 areas different than the average student (22 points difference) in any of areas between IQ and Academic performance he qualifies in most states in the USA for Special help. Because then they think he is smart and with some help he can excel. He can get help with the resource teacher, speech, or special class, or even special school if he has emotional problems. Some very bright kids and adults have ADHD. I think I have a little of that ha ha.