We took the advanced math exam today. It seems very likely that I will fail the exam. I want to send a text message to convince the teacher. Say what? Thank you.

It's no use texting. It's best to summon up courage to find a teacher and tell the teacher modestly and regretfully that my math foundation has been poor, and I didn't do well in this exam because I didn't work hard enough, but I regret it very much now. I didn't study hard because you taught me so well. I'm really embarrassed to talk to you, but I'm really afraid that my parents will blame me for failing the class. Please give me a chance to pass this time and let me play by myself. In short, we must be modest and regret. But be generous. Teachers usually hate answering students' phone calls, especially when they say such things, let alone text messages, so you call the teacher and say you have something to talk to him about. He said that when it's convenient for you, you can say it yourself. You can say whether you need to help him run errands or do something.