I was flunked by the teacher for no reason.

In fact, there is no need for teachers to have a hard time with students. There must be a reason. Find out the reason first.

If you don't remember or say no

Then the problem is simple. Students are just passers-by in the eyes of teachers, and students will have no influence on experienced teachers.

If I were you, I would text him and ask him why he would get a few points even if he was blindfolded. If he didn't like you, he wouldn't do it right. It may be due to objective reasons such as insufficient papers.

I hope it helps you.