AP Credit For UCs

Hello,
My question is that do the UCs cap the amount of AP credit you could use to skip general classes? How do you use AP credit when it is granted and it is used as “empty credits”? How do these “empty credits” help a freshman become a sophomore “in standing”? Can you actually graduate a year early with a lot of AP credit?

I know different schools count them differently, but enlighten me about how UCSD, UCI, or UCLA would grant these credits.

Thank you

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