I know that my son is served in school through special education as a student with Other Health Impairment (OHI) as diagnosed with ADHD. He has received services and educational accommodations for ADHD (as well as several other impairments throughout his schooling. Because he has current diagnostic testing and congruent educational accommodations in school, he will qualify for testing accommodations on SAT and ACT, as well as accommodations when he enters college. I believe current 504 accommodations also can meet those qualifications.

Generally, there must be record of current educational accommodations to qualify or testing accommodations, but I don't know the ins and outs of those rules. I would expect you can find information about this through your school's testing coordinator or counselor. You might try searching through the College Board website for information also.