How to report the malicious failure of a college teacher?

It is certainly not good for a university teacher to fail a course maliciously. A student can be admitted to the university, which is the result of studying hard at cold window 12 years. Therefore, the university teacher maliciously failed a student's course, which is equivalent to whether this student has studied hard for 12 years. If students want to report, it is recommended to report to the school guidance office.