Yes, they are there, but there is no blockade for users. I can still access the forum, without entering any quiz. In fact I do not get anything that alerts to the existence of a quiz.
1. You can go to quiz.php and browse quizzes. quiz.php?do=Take&id=X where X is quizID.
2. Yes, a percentage.
3. I have no idea. I have not seen a function to stop retries. So I guess members cn try again and again. So multiple choice is not adviced.
4. So far they do not have to enter anything.
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