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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."
Advanced Attempt Conditions on Quizzes
You can build a quiz that allows students to take a second (or subsequent) attempts on a quiz, provided their performance on an earlier attempt is below or above a certain score.
The "Min" box should have the lowest percentage a student can receive, in order to be offered a second attempt. If they score lower, they are not offered a second attempt.
The "Max" box should show the highest percentage a student can receive, if they are to be offered a second attempt. If they score higher, they are not offered a second attempt.
In the below example, only students who score below 75% can take the quiz a second time:
