You can reset the last lesson in the stage you're on.
Here's how: 

In your dashboard, go into the profile for the learner whose lesson you want to reset.

Here you'll find a double arrow button which you can click to reset the last lesson in your current stage.

Resetting the last lesson gives your learner a chance to start over again with the lesson they're doing. Just select to reset and it will come up again for your learner to do from the start. 

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