Hi Riccardo,
No, it's a pretty straightforward process. You create the quiz, choose time, etc. Then you add questions and answers... and set it as ready to be played. That's all. Currently it has only GRADED mode (one right answer). I'm working in a multiple right answers module.
You can use it for education purposes and yes, you can automatically move people to another group when they reach a specific rank in the quiz. All you have to do is give the proper permission in the section.
The quiz submitter receives a notification everytime someone completes it:
The quiz results all there on the Leaders Ranking:
Yes, for those who played and failed, not to everybody. They will got all the stats and info from the quiz, including quesitons with right and the chosen answers in the result: