I'm afraid of sending a text message to the teacher.

Hello, Mr x, I'm a student in your class. I didn't do very well in the XXXXXXXXXX exam. I didn't make good use of what I reviewed before. The whole exam is not enough. This is the most difficult exam in history. It is expected that I will probably fail. For a poor student like me, failure is really like adding insult to injury. After careful consideration, I decided to ask the teacher for leniency. Certificates will not cause trouble to teachers in the future. I implore the teacher to be magnanimous and let me pass the exam. Student number: XXXXXXXXX name: XXX.