Have they met or seen your DS? If they meet him and observe him in action it may make the case for you. My DS eventually proved to the elementary school what he needed, by being relentless in that way. It took quite a while, though, for them to come to understand him.
This school is 4-5 years off, right? Do you need to plan now, or can you keep doing what you're doing and see where he is then? I assume there will be some sort of testing you can do at that point (SAT?) to demonstrate what he knows. I mean, it's all great if they have the best math program in the country, but if they can't teach him anything by then, you'll be looking for other options in any case.
You can't very well put him in a math deprivation chamber till then. He sounds like quite a guy.
DeeDee
