We need more info where is the story?
Well, look at it this way: If you failed your test, and (for example) your siblings kept teasing or talking about it with you, you wouldn't feel very comfortable would you now? This what Justin probably felt like when felt that he wanted to avoid reminders of how he had failed.
Note: this isn't the "essay", this a place to start from, so you can write the answer in your own words.
Hope this helps!
Answer:
Dahl uses rhetorical devices such as facts.
The first one is the answer