Thank you everyone!

Oh, I wish I could get some credit for his achievement, but... Honestly, he is just self-driven when it comes to math. Math is not a school subject for him. It's his passion in life. He sees math/numbesr as beautiful language (He also thinks symbolic logic is fascinating.) and he's got this innate urge to know and experience it.
I'm just making sure that his burning passion for math will keep burning. We don't do repetitious math worksheets, but we often discuss a variety of interesting math subjects.
He just got into DYS, so hopefully, they can provide me with more info in the talent development.