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Organize everything in the Content Area, including any content or activities relevant for the release conditions. For example, to earn my certificate my students might need to achieve an 80% or better on each of four quizzes. I can list those quizzes in a content module, together with the link to the Awards screen. So students can complete the quizzes, and then easily find the awards screen below them.
Allow Multiple Attempts on a Quiz
Within the Quiz Editor's Assessment Tab, you can specify whether students can take a quiz multiple times, or only once. This is a dropdown menu under "Attempts."