Not OP, but I strongly suggest getting a full neuropsychological evaluation to diagnose your child. This could ADHD, it could be some other disorder, or it could be nothing at all, and a standardized professional evaluation is the best way to tell. They will also be able to suggest the best path forward for treatment. I can speak from experience, because when I was having trouble in elementary school my parents had be evaluated, which was how I was diagnosed with ADHD. I received behavioral therapy and medication and it really improved my functioning and my quality of life.