Talk to your son's teacher - the school district should have a Special Education Dept. The test to determine ADHD is very subjective and the psychologist should have sent questionaires to your family and your son's teacher (andy day-care provider if that applies) to look at behaviors. The Special Ed Dept should be able to help. I live in California and we have a document on file with the school called an IEP - Individualized Education Plan. This determines the accomodations that will be made for my son in a school setting. Also, unless your son is emotionally disturbed DO NOT let the school qualify him for Special Education benefits under SED - Seriously Emotionally Disturbed. He can be qualified under OHI - Other Health Impaired. The SED label wil follow him throughout his school career into college. Also, once diagnosed he is protected by the Americans with Disabilities Act. Get a copy and start reading.....Don't accept or follow blindly everything the school or doctor tells you - read up on the disability and be your son's advocate - YOU are in the best position to determine what he needs - I am speaking from experience. If I had left it up to the school my son would be a drugged zombie. He was diagnosed at 4 and is now 16. He carries a 3.3 GPA and is working on his Eagle Scout rank in Boy Scouts.
Good luck and God bless.