You can find preliminary info here:
https://www.gradschoolshopper.com/gradschool/browseby.jsp?q=3&cid=3 You can opt to sort through the info via various categories.
Is his score too low? I am very very far from well-versed on this topic, but I think it is going to depend on how you define good. I think he should ask his research mentors what they think and where he should apply. I suspect they might tell him to take it again.
Here is hoping he does very well on the PGRE!