Wouldn't WMI and PSI of 112-113 be more like 80th percentile? This doesn't sound like much of a "roadblock" to me, but maybe others have more insight?

Does he like school? I imagine that the combination of ADHD and really smart can make school seem boring (intellectually) and difficult (having to stay on task and listen) at the same time. That's how my DS11 sees school (doesn't have an ADHD dx yet, but might have one soon).

Has your DS started medication?