Here is a link to an academic index explanation and calculator...
http://www.collegeconfidential.com/academic_index/
http://www.collegeconfidential.com/academic_index_calculator/
It sort of works on a sliding scale, the higher the GPA the lower the SAT can be. You should also have him take the ACT.
What is his GPA?
I know he is not going Ivy but this will give you an indication of where he stands.
Also, you can have your son call the assistant coach (or whoever has been communicating with him) or have your club coach call the coach and ask what SAT score they need to see.