In many countries, such a problem is solved via that a lot of incapable students are "weeded out" by brutal exams (in particular "math for computer scientists"

In many countries, such a problem is solved via that a lot of incapable students are "weeded out" by brutal exams (in particular "math for computer scientists" exams are prone for this) in the beginning or in the first semesters - consider it to be a kind of hard "sink or swim"-style curriculum.