In "The Three-Point Turn," Justin is able to convince Becky that flunking the driving test will not be all that bad through a combination of reassurance and positive thinking. In Chapter 1, Becky is very nervous about taking her driving test and is worried about failing. Justin recognizes her anxiety and offers reassurance, telling her that even if she does fail, it won't be the end of the world. He tells her that many people fail their driving tests on the first try, and that there is no shame in not passing.
In Chapter 2, Becky takes her driving test and ends up making several mistakes. She becomes upset and assumes that she has failed, but Justin reminds her of their previous conversation and encourages her to stay positive. He tells her that mistakes are a part of the learning process and that she can always retake the test. He reminds her that she has already improved since their first lesson and that she will continue to get better with practice.
Through his encouragement and positive attitude, Justin is able to convince Becky that failing the driving test is not the end of the world. He shows her that mistakes are a natural part of the learning process and that she should not let fear of failure hold her back. By the end of the story, Becky is able to retake the test with renewed confidence, thanks to Justin's guidance and support.