Its just that cali publics can't offer therefore compete with what the privates are providing School size vs Teacher/student/adult ratio.
Here are the current top 25 in the Socal open division. Only 5 are publics.
The publics in metro L.A. are older schools. Its the new modern publics in suburbs 30 or so miles outside of LA that can take advantage San Bernardino Riverside Onterio Temecula Calabasas West Ranch
This list will be updated January 24, 2022 OPEN DIVISION (Alpha Order) DIVISION Bishop Montgomery Capistrano Valley Christian Centennial/Corona Colony Crossroads Crean Lutheran Damien Etiwanda Fairmont Prep Harvard Westlake Heritage Christian Jserra Mater Dei Notre Dame/Sherman Oaks Poly/Riverside Rolling Hills Prep Santa Margarita Serra Sierra Canyon St. Anthony St. Bernard St. Francis St. John Bosco West Ranch