keep in mind, acceptance rate is very related to your major. e.g. EECS at UCB is usually in the single digit although the overall rate is something close to 20%
36,000 California residents will enrolled into the UC campuses. 18,000 are Asians. 36 high schools in SoCal and 24 in Nocal are known as the feeder schools. A rough math is about 300 per school .