You need to check the residency requirements.
You would H ave to move to CA before your senior year of HS, not after you get accepted to college…if you want instate status as a freshman… You have to establish your residency 12 months before college begins (but do check CA…some states it’s more). And you would most definitely need to graduate from a CA high school.
Also…not sure about CA…but in some states…if you start as OOS…that is how you stay until you graduate. So do check carefully.
ETA…was yoir family planning to move to CA anyway? To quote another terrific poster…do NOT do anything for college purposes that you weren’t planning to do anyway.