There are framework curricula in every federal state, where the aims are set. Every school is responsible to carry out the curricula and to establish its own concept to do so.
The curricula for general education schools in Hessen can be found here: https://kultusministerium.hessen.de/schulsystem/bildungsstandards-kerncurricula-und-lehrplaene/lehrplaene
The curricula of vocational schools in Hessen can be found here: https://kultusministerium.hessen.de/schulsystem/bildungsstandards-kerncurricula-und-lehrplaene/lehrplaene/berufliche-schulen