AP credit won’t be useful for your major. It may allow you to enroll in a sophomore level class as a freshman but beware of the competition since they will be used to the rigor and pace. It won’t cut down your time.
As far as I know UCLA and UCB have so many full pay qualified applicants that they don’t need to offer merit scholarships. UCSC (as well as UCR, UCM) would. UCD perhaps. But even then the cost would be in the 50’s at best - not 30k.
As has been mentioned, you’d stand a better chance at the private colleges.