Wikipedia
Hauptschule
A Hauptschule is a secondary school in Germany and Austria, starting after 4 years of elementary schooling, which offers Lower Secondary Education (Level 2) according to the International Standard Classification of Education. Any student who went to a German elementary school can go to a Hauptschule or Gesamtschule afterwards, whereas students who want to attend a Realschule or Gymnasium need to have good marks in order to do so. The students spend five to six years at the Hauptschule, from 5th to 9th (or 10th) grade. They finish around ages 15 to 17.