When lesson or topic quizzes are manually graded in LearnDash (and the user receives a passing mark), users have to return to the associated lesson or topic to manually mark it complete. When enabled, this module automatically marks the lesson or topic associated with the quiz complete so the learner doesn’t have to take that step.
The lesson or topic will not be marked complete if the lesson or topic contains additional quizzes that have not yet been completed successfully.
can this work when the person get a respective grade in an H5P quiz?
No, for that you would need our Tin Canny plugin, which can support completion based on H5P activity.