Behind on school credits please help!

I'm about to be a senior in high school in the state of California. I go to a public school, I failed a whole year of US history and a whole year of geometry and one semester of biology. I need to know ways to catch up on these credits without my school telling me ways to make it easier for them. Like can I do online classes or weekend classes or what? Please tell me all the ways I'm begging for answers.