This is why every serious intermediate learner searches for .
Sollen means "should" or "ought to." Example: Du sollst mehr lernen. deutsch fur besserwisser b1 pdf
While there is no single official "Deutsch für Besserwisser" textbook published by Hueber or Langenscheidt (though the old Besserwisser series by Klett was famous in the 90s), the term has become a genre . This is why every serious intermediate learner searches for