The point of university is to learn, not to already know the course content by the time you get there. Plenty of high-school students may not have taken any com

The point of university is to learn, not to already know the course content by the time you get there. Plenty of high-school students may not have taken any computer science subjects during school, but may wish to get a degree in computer science. Universities with decent admission competition value well-rounded, high-achieving students. Such students are involved in a lot of co-curricular activities, may take many subjects, and have broad interests. It's perfectly reasonable to expect that they simply never had the time to learn multiple programming languages and compete in programming competitions, in addition to whatever else they do.