More accurately, UCB admits by division (L&S, CoE, etc.) and additionally by major in CoE.
Most of the popular majors among athletes and non-athletes at UCB are accessible to students who entered as L&S undeclared (the only way frosh enter L&S), but some like Computer Science, Economics, Business Administration, and Public Health have secondary admission criteria to declare the major (prerequisite GPA of 3.3 for Computer Science and 3.0 for Economics, and competitive holistic admission for Business Administration and Public Health). However, changing into a CoE major is typically very difficult.