In addition to your major requirements, you also have to complete the College requirements. Most of these are met by IGETC but you also have to have a certain minimum number of units and there is a maximum on how many they will count from community college. So basically, you will need to take more than just your major. Some people do a minor or a double major, some people take career preparation classes, some just take extra electives.
UCLA College Requirements: http://catalog.registrar.ucla.edu/ucla-catalog2017-58.html
UC Berkeley College Requirements: http://guide.berkeley.edu/undergraduate/colleges-schools/letters-science/#collegerequirementstext