“I’m trying to figure out if I should quit my job. I’m a college student & due to cl asdfadsf ”

I'm trying to figure out if I should quit my job. I'm a college student & due to classes. I have to take a cab to work (which = 1hr of pay). I'm constantly getting in trouble for things that I didn't do or doing things one manager told me to do w/o conferring w/ the other. Also, I'm worried that my grades will drop. What should I do?