I'm so scared that this will happen to me. Although I think I am just struggling because of my fucked up courses this year. In my physics course, my professor had to take on a completely different physics 2 class because the other professor got fired half way through for never showing up. In my Calc class, we went over revolving a solid about an axis for like 2 weeks but literally covered all of sequences and series in like 3 days and spent approximately half an hour on Taylor series (oh and the test is the next class session even though it was supposed to be the one after that, but apparently none of us would use that extra 2 days to study anyways so it's not worth it to him).