1) Impossible to give a duration limit if you select more then 1 chapter exam in the activation tool. You get 1 hours without hope of change.

2) Enrolling student after a activation don't put this student in the list of potentials students. You must reactivate a new set of exams for this student.

3) You can't, or I have not find the way, erase a activation that one craete withj error. And the posibility to correct thoses errors is limited. If I can create it, it's a little bit frustrating that I can't delete it.