What Do Admission Officials Know About Applicants' High Schools?

The colleges don’t need to look at Naviance to place the students within the context of their HS. Along with the transcript, the high school attaches a school profile which includes test by test (and section by section) breakdowns on SAT, ACT SATII and AP scores at the HS, as well as detailed information on courses taken and grade distributions. Most profiles also include prior year information on college enrollments or acceptances.

I’m not aware of any highly selective schools that say they don’t compare applicants against others from the same HS. For schools that are less selective, or not selective at all, why would they need to?