The SAT percentiles and Average GPA data is available on the UC website under Freshman profiles for each campus. I just consolidated the data for my use.
http://admission.universityofcalifornia.edu/freshman/profiles/index.html
The admit rates are found in the UCOP website. Usually the updated 2018 data will be available early 2019:
https://www.universityofcalifornia.edu/infocenter/freshman-admissions-summary
UCI is the only campus that I have found that publishes their average UC capped weighted GPA and SAT scores for each major. Again only 2017 data available and I am sure the #’s will be different for 2018 admissions.