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This depends from school to school, however, I believe that you can only repeat the class if you get less then 50% in the over all class/course. In order to do that, failing most or many of your assignments can do this.
50% is probably failing.
If all students receive a failing grade in a class room it is usually considered the teacher's fault and the students will most likely be transferred out of the teacher's class and the teacher may even be fired.
Grammatical nam after months of failing
If the probability of succeeding is 2%, then the probability of failing is 98%. The probability, then, of failing 75 times is 98%75, which is 22%.