@ka15ajlim: Since the original poster never updated this discussion, you should assume they are long gone.
Regents at the UC’s is usually the top 1-2% of the applicant pool. If you look at the 2020 Fall admit stats, you can get an idea of how competitive your son will be and each department will determine Regent scholars. Below are the 25th-75th percentiles for admitted students but not major specific.
**2020 UC capped weighted GPA averages along with 25th-75th percentile range: **
UCI: 4.11 (3.96-4.26)
2020 Data:
25th - 75th percentiles for SAT totals:
UCI: 1280-1510
25th - 75th percentiles for ACT composite + language arts
UCI: 27-34