You may have noticed that you’re given the option to [start over] midway through working on a practice exercise, a quiz, or a test. However, the "Start over" link is not available on Mastery Challenges.
Mastery Challenges are special, limited-time tasks that help accelerate your Mastery Progress. Mastery Challenges are there for learners to demonstrate that they’ve fully mastered every skill that makes up a course. For this reason, the “Start over” link is not available on Mastery Challenges.
For more information on Mastery Challenges and how they work, check out this article.
We hope you enjoy using Mastery Challenges to level up on your knowledge, and that you’ll share your feedback as you do so! Please share your thoughts with us in our Support Community or send us an email.