What excuse should I find to tell the boarding teacher if I want to change my dormitory at the beginning of school?

If it's because you don't get along well with people in your old dormitory, or you have a good friend in another dormitory, you can tell the teacher directly. If your study is affected by the dormitory, the teacher is unwilling. In this case, the teacher can understand the students. In fact, as a student, there is no need to keep secrets from the teacher and make up such and such reasons to delay your study. Sometimes being honest with each other is the solution to the problem! !