Demo Lesson at a Cram School = 0 yen

My son joined in a cram school today. That school is different from the school, which my daughter goes to.

My son took zero score in an English listening test in his junior high school. So I decided to make him go to a cram school to learn English.

Today he attended a demo lesson of the school. It was free of charge. He will go to the school in the evening once a week. One lesson takes 85 minutes.