In order to complete a course, you need to have learned a sufficient amount of items permanently. Learning permanently implies that you have spelled the study item correctly at least two days in a row, without listening to it beforehand.

If you have come across a new study item today, it is not possible to learn it permanently until tomorrow. You are not able to complete a course if you don’t have a sufficient amount of permanently learned study items. The program might ask you to switch to another course if it is not possible to make progress with the study items anymore today.