Every so often there is a clear example of exam fraud on EE.SE, where a picture of a problem is posted from an easily disposable account (low rep, fake name) and often a message along the lines of "quickly needed".
Most of the time these questions are quickly downvoted and closed, but too often hints or solutions appear in answers or comments. Often the OP deletes her own question (and account) once the answer is found (and to cover up traces). In my opinion it is unacceptable that people cut corners with serious matters like formal education.
To counter such abuse of EE.SE I propose to introduce a 2hr waiting queue for new questions from low rep users. Two hours is long enough for most exams to pass their deadlines and is in my opinion acceptable for sincere new users. I also propose for the OP to be unable to delete ones question during these two hours.
Good questions get upvotes, poor questions are downvoted. The low rep threshold can therefore be set as low as eg. 15 or so. Too many downvotes and a user drops below the minimum rep, then the question will disappear again during those two hours. It would require fair amount of time to prepare an account with 15+ rep in advance just for use for an exam, and once an account receives more rep it gets unlikely to get disposed of because she put effort into it.
Fortunately such questions are often quickly closed and deleted, unfortunately for this meta question I don't have any good examples at hand. For those with super power, search for "exam fraud" in my comments and you'll find several examples.