How do I make a complaint about a professor?

My SFT221 “professor” has given me really shitty grades in all my workshops, milestones and quizzes. I put in so much work for all my assignments and submitted them on time but I have only received 70s-80s/100 and even worse in the quizzes. My group members have received grades in the 90s and some got a 100 even after putting in less effort than me. Yesterday I sent her an email asking her for a re-evaluation and she ended up giving me a 50/100 on ms6 (ms6 grades weren’t out when I sent the email)
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