CA requires two years of math in high school to graduate, and your DS is only taking one with the school as an official high schooler. I would double-check with the school to make sure they'll credit him for one or more of the alternatives. Otherwise, your DS may be better served to take the regular trig/pre-calc class in 9th grade, and calc BC in 10th. If you can get them to credit him with the math he takes at the university, you can possibly drop an elective in 11th and 12th grade, which would give your DS more time and space to get his work done.
All of the desired schools are privates, which means expensive, so even if you feel you're on track to finance that, it might not be a bad idea to keep the door open to the UC system, because four years is plenty of time for a potential life-changing event. The UCs and CSUs both require a year of visual or performing arts. You've already identified a few electives that would satisfy that, so I'd make sure your DS selects at least one from that category.
Otherwise, it looks like a solid plan, and assuming he does well, coupled with his age, I don't see any reason why any school wouldn't want him.
