In California what are the requirements to get accepted into a college or a university?

There are different requirements for each college/university. These are called admission requirements. If you look at a specific college/university, you will find the admission requirements.

Depending on which exact university you want to go to there will be different requirements. The Cal State University's, the UC's, and the private colleges in California all have different requirements including which standardized tests they may require, the minimum GPA they accept, if an essay is required etc. I'd suggest looking online at the colleges that you're really interested to find out more about the required criteria as they all should have it listed on their website.