The thing with ADHD though, is that they CAN stay on task if they are very engaged. My DD for example, could put together large jigsaw puzzles on her own even when she was 3 or 4, and listen to entire chapter books on audio. So that really threw me off. It wasn't until I went into her 1st grade classroom and volunteered that I could see how unfocused she was compared to the other kids, and how long it took her to do things. She was slow with transitions, had to be reminded about everything, etc. But during group time she was able to sit very still and looked reasonable (although kind of spaced out). Ask the teacher how long it takes him to complete work...not something simple and boring like math that is too easy, but something else like writing a story (where the child determines their own level).
