Disappointed, but Motivated at the same time

Ugh....stupid math class. Due to circumstances that don't agree, i am now borderline failing my classs. I have not been allowed to makeup work, and have been told that i must ace the next two quizzes to pass. So i start studying my butt off. Only one problem, i'm going to miss one of these two quizzes for the road trip to get ready for my sister's wedding. And he has already said i can't make it up. So i'm stuck. I don't know what to do, but i don't want to give up. The idea of an incomplete has come aroud, but idk if i am eligible, i can't drop the course, it will put me under hours, and if i am missing a quiz, i'm doomed to fail. What to do?

I probably wouldn't be in this situation if i had gotten work back sooner and had nkown i wasn't doing my work correctly. The class functions as almost a "teach yourself" class, so i thought i understood the matierial, and didn't know that i was doing badly until about last week. I'm really kicking myself for not doing something about this sooner, but i chose not to make waves, which is going to suck now to reap the consequences. I refuse to be beaten, i'm going to resolve this, or die trying