The competitive admissions high school I went to (which has an SAT average similar to Ivy League universities) has a completely race/SES-blind admissions system and is now 70% Asian.
That's a function of local demographics as well though. Lowell high school in San Francisco has those numbers but that's in part due to (more affluent than average) whites long fleeing the SF public schools.
? Have you ever been to SF? That's not true for the general population and even less true for youth. And the white youth that are there tend to go to private schools