I was away with the fairies as a kid, teenager and often as an adult. I managed to finish school and get a postgraduate degree, before I was diagnosed as inattentive type ADD when i was 35.

It's not the end of the world. ADDers are pretty creative types and can come up with some amazing ideas. We just need others to implement them

He may well be learning, but just by thinking his own thoughts in his own time. Obviously, if he's falling behind though, it wont hurt to see a professional for some help. I cruised through school until about year 10/11, when the need to actually apply myself hit me and I fell behind.