According to Google, the noun prerequisite refers to a required prior condition that is necessary for something else to happen or to exist; I’m paraphrasing.
In school, a course prerequisite refers to a course, the successful completions of which, is designed to ensure success at the next level. That is, if a student barely manages a D in Math 100, there is a good chance they will also struggle in Math 200. This is the most misunderstood concept of the course prerequisite. Finishing with a D may be good enough to earn a credit, but a D will typically lead to future D’s, or even F’s.
In a perfect world, students would not be deemed to have met prerequisite criteria unless they earned at least a C, if not an A or a B. You see, the ‘taking of the course’ is not the prerequisite. ‘Mastery of course content’ is the intention of the prerequisite.
Any student can take up space in a lecture hall. Plugging in while there will increase not only your level of mastery, but your chances for future success. Then seal the deal by working outside the classroom, i.e., do your homework.
Cognitive engagement in the classroom along with deliberate practice outside the classroom are the one-two punch that will guarantee your success.