We went through the same with my oldest son in second grade and the school wanted us to put him on adhd meds. I pulled him, homeschooled him and by middle school he had grown out of it. No issues with grades, SATs or paying attention in college. He is successful in his career as an adult. A lot of normal active boys were drugged up during the ADHD craze.
Re: ADHD
Did they check for allergies?
A close relative had allergy tests done on his young son who couldn’t sit still and focus; shortly after taking any offending foods etc out of his diet, he calmed down and could focus.