Homework preparation
When adding a new subject or editing an existing one, you can use the check box highlighted in the picture to mark those subjects that require homework preparation. 
You can then specify the maximum number of these subjects that can be taught in one day. You can specify this individually for every class:
This way you can balance the time students need to spend preparing for school every day. You can avoid situations where a class would have one 'easy' day, e.g. informatics, physical education or ethics, followed by a 'hard' day with a lot of subjects with home preparation.
 
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