I am wondering what kinds of things I have to do to pass the California drivers test, like backing up, three point turns...
If the dealer's insurance or your insurance covers it, and if you are allowed to drive with just ANY adult licensed driver supervising you, then yes. Will the dealer let you test drive it? That's another question entirely. Used or new makes no difference to anyone but the dealer. They're not likely to let ANYONE test drive a vehicle if they think they're going to abuse it and think there's no chance the person will buy it.