Would the school be willing to allow adaptations for your DS. Maybe recording class instead of note-taking? Allowing him/you to type his work for him instead of handwriting?

Can you see assignments, a past test, and a sample of the level of writing work expected for a 7th grader in the class? That might tell you if it's possible for your DS or not.

I don't think I'd worry about running through the science curriculum early at this point. If he's capable of doing 7th grade work now, then that's going to happen one way or another really, isn't it? Out of class, if not in it, you know? And if he does it through official channels, then there's a much higher possibility of the school providing something more advanced for him when you get to that point. That could be a very good thing!

Kriston