Any school system is not going to provide any education for him. Just write it off, and take things into your circle of influence. He needs someone to teach him material at his level. Whether it’s a family member, or 2 dedicated hours a day with a tutor.

Now as others have pointed out here intellectual development is only one kind. You may see your son as exempt from certain requirements and activities, when he is really not. If you have dedicated time where his intellectual needs are met you will less tempted to step in and save your son from important life lessons.

It’s difficult to express exactly my experience. I know you are proud and excited for your son. But remember he is only with you for a short time, and being smart and getting degrees and jobs etc is such a small part of having a good life. If you only focus on that part he may have a very hard time and not be able to take advantage of his gifts.