Questionnaire (plugin)

i have teh same problem !
in the first page of each course for all students
i want to let a questin form(using teh questionnaire plugin) to get feedback about their teacher and course contetnt...
but i want that to be mandatory : only those who have completed the form can see teh course contetnt ....

is there a way to certify if a special activity have been done by a user and
bind this condition with other LMS contents(courses i mean) to block that contetnt untill that special activity is done