Are the admission requirements (ie grades, sats, etc.) different for prep school students applying to top universities?
This is just information I’ve garnered from attending a prep school, and nothing official, but: top universities don’t have a set cutoff for grades, SATs, etc. Saying that, they’re usually aware of the fact that some schools have harder grading systems than others (which is how the SAT helps to show people on a comparative grading system) and so take the grades with a grain of salt. That being said, most prep schools have sent MANY students to elite colleges, and so the admissions officers will recognize the fact that so-and-so attended school X which is known to be very academically challenging and then will acknowledge how good the applicants grades are for the school they have attended. That being said, it’s still very possible to get good grades in a prep school, so even if you attend school X if you’re practically failing all your classes they might question if you really belonged there.