What are your UC GPA’s?
What are your test scores if you have taken either SAT or ACT?
EC’s, HS course rigor?
The %acceptance rate by major is not available for in-coming Freshman and it would not tell you how you compare. You need average UC GPA and test scores by major to help gauge your chances which is not available but you could check the admitted student threads for information.
Based on your UC GPA, I can give you admit rates (not major specific) for each campus. Exception: See UCI below
All UC’s are competitive for all majors. For UCB, the College of Letters and Sciences does not admit by major.
For UCSD and UCI, they admit into the University first and then into the major.
UCI does have some 2019 data for Philosophy majors but that is the only UC where I found this kind of data and this is for enrolled students not admitted where the stats are usually higher:
Average UC capped weighted GPA: 3.98
Average SAT: 1337
Admit rate: 27.5%
The majors you have listed are fine if you plan to attend Law school. Any major of interest where you will excel will make you a viable candidate.