Remember taking your written driving test? Was it difficult? Did the questions surprise you? Did you fail the first time? You're far from alone if you did. 

The California DMV says the average failure rate over the past two decades is a little over 50 percent. Maybe that explains why people drive the way they do. With us now is Kevin Cruz, owner of Drive Test Car Services in Costa Mesa which is a driving school. And Roddy Roediger, professor of psychological and brain sciences at Washington University in St. Louis. He's co-author of the book "Make It Stick: The Science of Successful Learning."