Wow, and he is your kid?
Just kidding, I could not resist.
Good for you for putting him into an a school where he could excel. That is commendable. Not many folks would bother to do that.
Keep him challenged to learn and he will continue to do very well. You may find that even at his current school he is not challenged enough, so be prepared to do take over some of this yourself (if you are not doing this already)
BUT, remember to let him be a kid and have fun and do stupid and goofy things and screw up lots. (I am sure you don't need that advice but some do).
Cheers