This is all so helpful - thank you very much. Sounds like achievement tests are our next step.
Dottie, thank you for sharing that grade acceleration for math worked for you. On some level, I think I just need to hear that this change may be enough from someone who knows what they are talking about : )
Cricket2, I don't get raw data until Wednesday.
Grinity, I agree that humility is an important lesson for kids like ours. The struggle with my guy is that he has a number of emotional things going on - perfectionism (had a total shutdown in art class because he is "terrible - no horrible Mommy!" at art, anxiety (nailbiting, incessant hair-twirling), occasional outbursts ("You are telling me this is going to be required by TWELVE YEARS!"), etc. I worry that exposing him to that higher peer group will hurt, not help. But, as you said, some things are worth the risk. And, it sounds like he would have many kids like him.