Those are amazing scores Marcy. It is good to have independent confirmation of what you suspected and that can help with advocacy. The difficulty is that children at that level of Giftedness generally need substantial accommodations to their educational pathway. A couple of hours of enrichment means very little. You may well be looking at grade skips, yep multiple.

If you haven't looked into how level of giftedness can impact school decision making I would start looking in that direction. You also need a serious and lengthy conversation with the school who may have never seen, or recognised, a child like your son before. At his age you don't want to be doing all his schooling after hours. His day needs to have meaning and he needs time to be a kid. But to do that you have to educate yourself first. Unfortunately you can not rely on the school to be the experts in this situation.

Start by downloading A Nation Decieved and a Nation Empowered from the Acceleration Institute

http://www.accelerationinstitute.org

Having gifted kids can be hard work, including loads of reading and research, but it is worth it.