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My son has regressed in his studies. How to send a text message to the teacher?

Hello, Mr. X, I'm the parent of a student. I found that my child's grades have dropped since the last exam. I don't know if it's because the child didn't study hard at school or other reasons. Let me talk about him at home. Give the teacher trouble.

If you think it's okay, remember to adopt. I think it's ok to say so.