I'm in California too, and wanted to retake Algebra - years ago. Since I had already taken it they said that I could ask to re-take it. It wasn't a problem for me, have you spoken to any higher-ups? Also, many of the community colleges now have on-line programs up north here at least. I've taken a few myself. Don't forget community colleges that get looked over like Yuba City, Sierra Foothills, etc...