Has he visited any of the schools that are on the list? 2 extremes regarding schools on the list, 2 large public universities and 1 very small LAC so what is he looking for besides a SoCal location?
Undecided can be an issue with the large universities, especially if he may be interested in CS.
SDSU admits by major into the University and CS is highly competitive so changing majors later might be an option.
UCI admits into the University first and then into the major and will consider an alternate major however, if not admitted into a highly competitive major like CS, then the student will have to take pre-req courses, maintain a minimum GPA and if spots are available, then be allowed to change majors.
My advice if he is looking at UCI and SDSU or any other UC’s/CSU’s, to apply to CS or any another competitive major and then switch out to less competitive major if the original major is not something he would like pursue.
Some college suggestions: USC, Chapman, Occidental, LMU, Cal Poly Pomona, Cal State Long Beach, Pomona College (Claremont College Consortium), UCSD, UCR.
If he likes Soka, maybe look at Vanguard University- Costa Mesa??
HS course rigor is Very Important for the UC’s and Cal states so he will only have 3 AP’s by end of Senior year? This area may be lacking. How many AP classes are offered at his HS?