About 61% of foster youth in California graduate high school on time. Past 18 things turn into a messy patchwork of semi support, simply successfully transitioning to a point with a high school diploma, a job, and stable housing is a success story. Many are homeless at points, and living on the street is the backup plan if anything goes wrong. (Note: non-CA experience, but Google shows a similar alphabet soup in CA.)
NFYI says about 3-4% of foster youth graduate with a 4 year degree.