As you can see from my test, my only fault was a fail to observe, 10 demerits. Why? I stood too long at a 4 way stop.   I came up first to the four way stop.  I saw the car coming on my right and I stood there waiting for him.   Then I realized, oops,  I'm at a four way stop,  it was my turn to go.   I got docked 10 points for that.