I'll start by saying those numbers are incredibly impressive. I'm not entirely convinced I could pull off such averages while playing against fifth graders. That said, I took a look at his alma mater and under "alumni" for his graduating year, there's only 14 students. That's not to say his statistics aren't impressive, but at 7'1'', in a division likely filled with other schools just as small, I can at least better understand how it happened.
The list of alumni (he was 1990): http://www.kingacademy.org/common/content.asp?PAGE=470