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Why do challenges sometimes contain skills I’ve already mastered?

We include these skills to help you review what you’ve learned and ensure that you remember it.

  • If you answer multiple review questions on the same skill incorrectly, your mastery level may go down. The goal isn’t to penalize you; it’s to help you identify skills you may have forgotten so you can brush up on them.
  • If you answer a review question correctly, you’ll see that skill less often in future challenges.

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