DUH.
Russia, Ukraine, and Belarus also have similar systems, and they punch way above their weight in math and CS: https://www.imo-official.org/country_team_r.aspx?code=RUS https://www.imo-official.org/country_team_r.aspx?code=UKR https://www.imo-official.org/country_team_r.aspx?code=BLR
Ironically, the US schools do have tracking. For athletics.
The US absolutely _needs_ to have a school system that challenges students. No more nonsense about racist algebra.