I'm not Dutch, but I have allowed myself to be told that in the Dutch university system nearly every applicant gets accepted, and those with insufficient course credits get kicked out at the end of first year. Is there even a hint of truth in that?
On the other hand, master's degree programs tend to require a bachelor's degree that has sufficient overlap in terms of courses. So to start a Computer Science master's degree, you'd probably need some bachelor's degree in engineering, math or physics. If you for instance got a bachelor's degree in Psychology, you'd probably need to attend several courses in order to be allowed to join.