I was curious about how the top high schools do at UCLA and UCB so I ran some numbers! First bracket is UCLA, second is UCB.
Harvard Westlake: (26% accepted, 10% enrolled, 3.87 GPA applying, 4.16 GPA admitted) (34% accepted, 30% enrolled, 3.90 applying, 4.08 admitted)
Flintridge Prep: (29% admit, 22% enroll, 4.03, 4.23) (42% admit, 36% enroll, 4.08, 4.25)
College Prep School (24% admit, < 50% enroll, 4.14, 4.26) (34% admit, 23% enroll, 4.14, 4.25)
Harker (26.4% admit, < 12.5% enroll, 4.05, 4.26) (39% admit, 28% enroll, 4.06, 4.26)
Bishop's School (24% admit, 36% enroll, 3.95, 4.20) (22% admit, 38% enroll, 3.98, 4.15)
Francis Parker (41% admit, 25% enroll, 4.04, 4.23) (40% admit, 24% enroll, 4.06, 4.21)
Oxford Academy (16% admit, 37% enroll, 3.79, 4.23) (21% admit, 48% enroll, 3.87, 4.17)
Gretchen Whitney (14% admit, 29% enroll, 3.93, 4.2) (29% admit, 45% enroll, 3.96, 4.2)
Lowell (14% admit, 41% enroll, 3.87, 4.2) (13% admit, 64% enroll, 3.87, 4.18)
Gunn (15% admit, 10% enroll, 3.97, 4.25) (21% admit, 46% enroll, 4.03, 4.25)
Canyon Crest (24% admit, 26% enroll, 3.96, 4.18) (36% admit, 52% enroll, 3.99, 4.18)
Torrey Pines (21% admit, 25% enroll, 3.99, 4.23) (32% admit, 64% enroll, 4.03, 4.18)