Karim had an interview for his first job at a bookshop. He was nervous, so he prepared carefully. The night before, he read about the shop on its website and wrote down three questions to ask. In the morning he chose clean, simple clothes and left home early, because he did not want to be late if the bus was delayed. He arrived fifteen minutes before the time and waited quietly. During the interview, the manager asked why he wanted the job. Karim answered honestly that he loved reading and enjoyed helping people to find books. When the manager asked about his weak points, he said that he was sometimes shy, but that he was working to improve. The manager smiled and said that honesty was important to her. A week later, Karim received a phone call offering him the job.

Question: Why did Karim leave home early?