Going to CSU at the same time as a local Community College and then transferring to a UC

I agree that I thought a good majority of your units had to be completed at the CCC.
You need to talk to a counselor at the CC. Some credits that the CC accepts will not transition to the universities.

Most of my children’s AP classes were used for rank credits at their UC/Caltech/SUNY and a few AP credits met prerequisite credits, but no HS classes were really used to “waive” 2 years of GE’s. They still had to take “College __________, 101”.