In a series of videos, the California DMV goes through the state's top 10 mistakes made on the driving test. So much so, they give you the examination answers ahead of time! All you have to do is study. Granted, it's a nerve-racking experience, but keep in mind that the California Department of Motor Vehicles wants you to pass. That's the goal: to ace your test on the first try and then start driving on your own.
If all things go well, you'll only have to take your road test once.