Tutorial - keep track of work

[ValeErre87]

A volunteer suggested the possibility to suggest a volunteer to take the tutorial again if his/her answers don't match the right answers, his/her progress is not great or he/she doesn't log in for days.
To do so, we should keep track of the volunteers' work and present them with a pop up window or just a message on the page saying something like "It looks like you didn't log in in the last X days. Why don't you take the tutorial again?" when of the cases above apply.

Do you think this is something feasible?