@Michal Doruch, I think the OP is referring to class as in classroom e.g. a digital registration system.
However, I agree with you that they will need to complete more than 4% of the course to do this.
Ah, my bad.
So you can just simply use any loop and printf. But if you want to make array of strings, then I would use double char pointer which is imo too hard for someone who completed only a few lessons yet