One thing I find hard is figuring out how the difference in private schools vs public schools figures in. For example, for many schools I can only find GPA ranges for weighted GPA. I can apply the weighting formula our local public schools use to his GPA and he’d have about a 4.3.
On the other hand, I think that if he attended public schools and had 0-1 AP class, that would be held against him as “lack of rigor”. But maybe it won’t be since his school doesn’t offer any?