Don't blame others for your problems, just do all of your work.
I have an F in english because my teacher refuses to fix my grades. I turned my work in, she graded it, %100. I go home and check my grades and she put it in as a 0. I come back to school and tell her and show her the assignment. She says she put my grade in for it so I told her that she put a 0 in on the grade book. She says she'll look into it but never does.
Forever a 0 in the gradebook because she can't do her job right