It looks like San Marcos High doesn’t send a lot of its graduates to University of California. For SY 2008-2009, only 40 applied to UC and 36 were admitted. That’s a little bit on the low side for a rank 9 school. Here’s some (Applied/Admitted) stat for selected schools from http://statfinder.ucop.edu/

San Marcos
Systemwide – 40/36
Berkeley – 14/3
UCLA – 18/4
UCSD – 27/9

Mira Mesa
Systemwide – 128/108
Berkeley – 45/17
UCLA – 69/20
UCSD – 99/37

Eastlake
Systemwide – 121/110
Berkeley – 45/15
UCLA – 57/12
UCSD – 82/36

Scripps Ranch
Systemwide – 202/183
Berkeley – 100/30
UCLA – 125/25
UCSD – 123/48