Replying to Anybody have experience dropping classes?

So I'm frustrated as fuck right now, I am taking Business Calc this quarter and my professor flies through the material at the speed of the millenium fucking falcon. The class was originally around 60 students and it is now week 8 of a ten week quarter and we have about 28 students, the rest have dropped. I have a 72 in the class right now and just failed another quiz, which should drop me to around a 70. I know the basics of the material but my cock gobbler of a professor puts the hardest questions on every quiz an exam.
I guess the bottom line is I am considering dropping the class because I know I can get a better grade by taking it at a later time, but the problem is that it is a required course to get admission into the business school and I don't have the time to be dropping courses. I have many classmates in the same situation as me and I guess I am just in a shitty mood. Has anyone been in this situation before? Would it be smart to drop the class before my grade dips into the 60's or should I just try to stick it out?