Always late for school? Have teachers who are unreasonable?Afraid of low grades?

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Hello guys, I just want to ask you what are the remedies to these questions, you can give your suggestions and even experiences how you overcame these events in your life since I encounter these problems every semester and I am getting frustrated that there is always a teacher in my class that gives me failing grades for no particular reason, one is in my humanities 1 a class this semester. He gave me 8/30 on my exam which really frustrates me since the exam is not identification, multiple choice but interpretation and application of humanities to a drawing. I find it unfair and I'm scared of having low grades in his subject because He's the only one who gave me that kind of score, my major subjects particularly Legal Philosophy, Criminal Law, Obligations and Contracts, Parliamentary Procedures, and lots more of Legal Studies subjects have high grades and scores in my exams and my class standing but when it comes to this minor and irrelevant subject I get 8/30 and my seat mates who are failing in our major subjects gets a score of 28/30? Any comments and suggestions? What should I do? It adds to my stress as a student and I think it's been another source of my insomnia and depression.