My son is diagnosed with ADHD and high IQ and labeled "gifted". He's very immature, has absolutely no method, is very impulsive and can't maintain focus for more than 20 minutes. He seems very much less mature than his peers in anything.
Yet, he just understands and remembers every single thing at school much better and faster than his peers. So I guess technically that makes him "gifted" but it's not a very useful gift. It just creates problems at school because he gets bored quickly but cannot be given more work to do because he gets exhausted quickly too!
I read recently a title of an article that said "gifted children are special needs children" and that marched my experience.
As a former gifted child who was emotionally immature and gifted, I hope your kid gets the guidance I never did both to understand his adhd and how it impacts him, but also emotional compassion for himself and from parents about how hard adhd can be
Many are more expensive in time and money, but you may find fairly cheap alternatives.
Worth a shot at least.
And every child is different because it's often not just ADHD but also other things.
But we're in a much better position now to help him.
My main point is that from my experience "gifted children" very often come with all other sorts of problems that put them in the category of special needs children and it's not just that they are mentally one step ahead of their peers.