“and Art/Music (if he’s not completed this for his A-G reqs - could be graphic design I think).”
@MYOS1634 is spot on. Your son needs to meet the basic core requirements for admission to the California public universities. Those A through G requirements are firm.
My son was a CS major. In high school, he was able to take CS, but his priority was just meeting the basic requirements for admission to the UC system. He wanted to make himself as competitive as possible just to get in. That included four years of a foreign language and the “F” requirement, which he completed in ninth grade.
If your son is seriously considering the UC’s, you need to make sure that he has completed the minimal requirements for admission. People tend to overlook the F requirement in Visual and Performing arts. The admissions committee will check to see if he took the F requirement in high school. It’s not an “elective”, it’s a requirement for admission. He needs a year of this requirement if he plans to apply.
If he doesn’t take the course, then he needs to have a strong AP test score in that discipline area. If those courses are available at the school, and he doesn’t take it, he has a strong possibility of rejection just for missing that particular requirement.
Your son needs to get the core requirements done. That means he needs the Spanish foreign language requirement and he needs visual and performing arts, and all the other core requirements just to meet admission basics. He will be competing with 160,000 other applying students for a spot at UCLA and UC Berkeley. If he doesn’t have the basic admission requirements, It will be very tough for him to get admitted to one of the UC’s.