What did the boy often do at school?

W: Don’t you have any good news?
M: No. Yesterday I had to stay after school because I was talking during my science teacher’s class.
W: You’d better keep quiet during class.
M: Sometimes I do. The day before yesterday, I was very quiet during my history teacher’s class and I still had to stay after school.
W: Why?
M: Because I fell asleep in his class, but it was not my fault. His class was too boring.
W: I advise you to take school more seriously. If you don’t pass your exam, you’ll have to go out and work as a result.
M: But I think working is more interesting than having boring classes every day.