What are the big 3 UC schools?

Excuse me, but could you clarify for me which "UC schools" you are referring to? Are you asking about the top three universities within the University of California system? If so, the debate over the "big 3" UC schools can vary depending on various factors such as academic reputation, research funding, and student satisfaction. However, some commonly mentioned institutions that are often considered among the top tier within the UC system include UC Berkeley, UCLA, and UC San Diego. Could you elaborate further on your question or provide any additional context?