Are the tests unfair? I find it hard to believe that the students wouldn’t voice their opinion about it during the semester. HS grades are overinflated, so being a 90s student means nothing anymore. Just an FYI, you should try to use other resources to supplement your learning. You’ll meet bad teachers throughout your academic career, so it helps to find other points of remediation.

Did your classmates try to get some one on one time with the teacher? What steps have they taken to rectify getting low grades during the semester? Complaining at the end is

Since you’ve stated that the teacher is the department head, complaints won’t do anything.