USC only ranked 66th in World University Rankings 2018. Most of UCs are higher:
UCLA 15
UCB 18
UCSD 31
UCSB 53
UCD 54
USC 66
https://www.timeshighereducation.com/world-university-rankings/2018/world-ranking#!/page/0/length/25/locations/US/name/california/sort_by/rank/sort_order/asc/cols/stats
Also UCB rank #4, UCLA #5 in money rank, USC no rank
http://time.com/money/best-colleges/rankings/best-colleges/