do what my friend did, he had like a low D in one of his business classes. email or see the teacher and ask him if you should drop based on your current grade, teacher will probably tell you to drop. then ask him if its ok for you to sit in on the rest of the lectures. then, dont drop the class, dont miss a single day, sit in the front where he can see you, try to participate if he asks questions. at the end of the semester, talk to the teacher again, blah blah i tried my hardest, i improved, teacher passed my friend. he did this again in all of his classes his final semester except he told the teacher that it was his final semester and he didnt think he would be able to try as hard again. needless to say he got his degree lol