We are using a quiz as a formal exam. As such I have set the attempts to allow only one. If a student fails to achieve the required grade (75%) I would like the teacher to allow the student to retake, but the first attempt scores must be kept.
I could set multiple attempts, with say 24 hrs before retaking. The trouble with this is that a student could retake the quiz without approval, and more important a student who passed, but not well, could have a second go in order to try and improve their result.
What I am looking for is a way of locking out a student who has passed, but allowing a failure to retake, after a set interval, or with the teachers authorisation.
A perfect solution would be to set for one attempt only, but allow the teacher over ride the lock to permit a second/third+ attempt.
Is this possible? Or has anybody got any good ideas on how to do this? I am using version 1.6.4+.