I am thinking more of school interventions and options and most people who post here (certainly not all) realuze that in general, I am not in sync with mainstream Americans, am critical of the country and, heck, wish id been born in Canada.
Having said that, reading your experience with J and the French school whom I believe told you they had never before had a child with A D HD is alarming. Our system is really flawed here and it can drive you batty fighting for school services, but once you get them, they are often helpful. And all school workers are aware of adhd, Autism Spectrum Disorders (ASD), everything. They often would rather not spend the money on a special needs kid, especially if marginal, but they often do, if the parent brings an advocate and does not give up. You do have to fight for what you want your child to receive and often not alone.
It isnt necessary to homeschool, although sometimes a parent may choose that path for a child who can't settle down in school, even with, say, an aide.
Sonic has Autism Spectrum Disorders (ASD) which is a lot like A D HD only with severe social skills and often behavioral impairments. Sonic got good enough help, partly because we pushed and pushed, that by age nine his behavior, focus and learning skills were very improved. I give his Special Education teacher and aid the credit, plus Sonic himself. By high school he was nearly mainstreamed and is doing well as an adult. He lives in his own place, works part time and everyone loves him. I hear how nice he is all the time. Sonic started his life with us screaming, not sleeping, breaking his bedroom door with his head, biting, and very delayed. He started community interventions at before age two. It shows. The early part offered in my opinion were everything. They were free. At three he began special school.
You have not posted for a long time and its quite possible I am remembering wrong about the school in France and J so I very much apologize if I got that wrong. Also in this thread you mentioned the UK.
Have a nice day. Apologies if I misinterpreted something! And, trust me, I hardly feel the U S. Is perfect. Would move to Canada if I could.