I wanted to quit the choir, but the teacher refused to say anything, saying that there was a competition and there were few people.

Personally, I think: teachers should not be rejected. I am a college student, and I think people should have a skill besides studying, which is your advantage over others. It's easy to boost your confidence. There are three reasons: first, watching the school choir does not necessarily delay learning. Relatively speaking, junior high school students still have a lot of time. And the teacher will definitely consider your study and pay attention to arranging time. Secondly, joining the choir is a good opportunity for you to exercise your various abilities, such as communication skills, and subtly make your personality develop in a good direction, such as being cheerful. Third, if you really delay the study time, you should explain it clearly to the teacher, and I believe the teacher will understand you. If you really don't want to go and want to find a reason, just say that your parents don't agree, for fear of delaying your study. Of course not, teacher.