I have a friend who shows major symptoms of both categories of ADHD. But these behaviours are only/mostly at school. For ADHD to be diagnosed, the symptoms must impact 2 or more locations, such as home AND school, or home, school, and summer camp, etc. She genuinely seems like she has the disorder, and fits it to a T. But it’s only at school! I don’t know what it could be.
In my personal opinion, the symptoms of ADHD can be more pronounced in a school settings than they might be at home. At least for my son, his symptoms were much more noticeable in a setting where he had to sit still and remain quiet for long periods of time (like at school). At home, the symptoms were there – they just weren’t as noticeable.
My son’s diagnosis included testing that had input from teachers, parents and other caregivers which gave the doctor a more comprehensive look at my son.