Remember that there is no German school system. Education is subject of state (Länder) law. So there are quite some differences between different parts of Germany. Traditionally, some 30-40 years back you were supposed to know whether you go to university or not at the age of ten.
However, this is no longer really the case. Many prepare for university in theory, but never go there.
However, this is no longer really the case. Many prepare for university in theory, but never go there.