The primary determinants of āplacingā large portion in āsuper eliteā colleges are having competitive enough high school admissions such that a large portion of the class has a decent a shot of being admitted to āsuper elitesā, and having a large portion of the kids who have a good chance of being admitted to āsuper elitesā choose to apply Selective public magnet HSs can do this, as well as selective private/boarding HSs.
To determine whether attending the HS offers any special admissions benefit, you need to look at more than just matriculation totals. Much more useful is to look at the portion of students who applied and acceptance rate, with some type of control for individual student performance or stats.
For example, some stats for Thomas Jefferson are below, which is a public magnet in VA. During the polarislist sample years at https://polarislist.com/, it was the HS with the largest number of matriculating students to HPM ā 96 in in 4 years (Bergen was #8 at 64 in 4 years). This larger number partially relates to having a large class size. Unfortunately, I did not find any breakdown of admit rate by stats/rank ā only overall admit rate. TJās school profile mentions a 34.4 ACT and 781/734 SAT, so I applicants typically had very high scores. TJās pre-COVID admission used to also consider grades, rigor, LORs, essays, and personal/character criteria; so most TJ applicants to āsuper elitesā likely excelled in non-score criteria as well.
Some areas where public magnet school kids may differ from private/board schools are having different demographics (TJ used to have very few low income kids, be 60% Asian, and 3% URM at time of PolarisList captureā¦ this is rapidly changing) and having different application behavior. This different application behavior can include public magnet kids being more likely to apply to in-state publics, and not top of class kids being more likely to apply to āsuper elitesā, particularly in early round.
Thomas Jefferson Admission Stats: 2017-19
UVA: 79% applied, 56% admit rate, 32% yield, 14% attended
Cornell: 37% applied, 16% admit rate, 52% yield, 3% attended
CMU: 32% applied, 26% admit rate, 42% yield, 3% attended
Stanford: 28% applied, 6% admit rate, 83% yield, 1% attended
Penn: 28% applied, 13% admit rate, 40% yield, 1% attended
Princeton: 25% applied, 8% admit rate, 67% yield, 2% attended
Duke: 23% applied, 13% admit rate, 54% yield, 2% attended
MIT: 22% applied, 11% admit rate, 80% yield, 2% attended
Harvard: 21% applied, 7% admit rate, 67% yield, 1% attended
Yale: 17% applied, 11% admit rate, 50% yield, 1% attended
Chicago: 16% applied, 18% admit rate, 50% yield, 1% attended