> What do you mean by can't go? People "can't" go to high-school either if they don't get the minimum grades required in elementary school.

The US lets people go to college who haven't graduated from high-school.

Flunk out or quit, and you can go back.

> > You already said that you/your country won't pay much, so why is it wrong for me to express the same sentiment?

> Uhm, no? In what way?

Your country says "we'll let n people into college." or "we'll spend $x on colleges, which is basically the same thing. The tests are then used to pick those n people.

What happens to the other people, the people you won't pay for?

35-40% of US adults have graduated from college. (Different sources have different numbers.) >10% of US adults attended some college and didn't finish. (Some do go back.)