What happens when you just cannot pass a class?

Howdy everyone! Basically, I've been taking the Applied Probability&Stats course since my last term, extended it to this term, and after talking with my PM we agreed to move it to the end of the term so I can focus on other courses. I'm not looking for tips and tricks on passing it, I've looked at just about all the posts available on Reddit and have been studying for about 2-3 months at this point. I'm simply wondering what happens when you come across a course you just cannot pass? Has anyone had that kind of issue before?