UC postbacs are hard to get in because they are mainly looking for URMS. You either have to be URMS or have to show to them your desire to serve in under served communities. They also pick handful of students from hundreds of applications. There are other postbac programs in California. SFSU, CSU Eastbay, and etc. Some DO schools have postbac/smp programs as well (Western, and Touro). If you look through this forum, you will find more information.