Two years of college-preparatory science, including or integrating topics that provide fundamental knowledge in two of these three subjects: biology, chemistry, or physics. One year of approved interdisciplinary or earth and space sciences coursework can meet one year of the requirement. A third year of science is recommended. Computer Science, Engineering, Applied Science courses can be used in area D as an additional science (i.e., third year and beyond).
Subject requirement (A-G) | UC Admissions
Has he met this? From what you’ve posted he may not be UC-eligible