Welcome!
I think you will find that all of the possible schooling options have met with some success with someone here. Your options depend on the resources you have available, and your child and family's needs. I will say that doing math by himself is one of the less attractive options, as instruction is important even for gifted learners, as is a learning community. But even that might be the least-worst solution, depending on your other circumstances. Perhaps you can tell us a little more about the kind of learning environments that seem to suit him, and some of his specific educational needs.
