A lesson has a draft you edit and a published version students see. They are not the same thing.

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Click Publish in the top right. A dot on the button means you have unpublished changes.

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Until you publish, your edits are invisible to students, so you can work on a lesson that is already assigned without disturbing anyone mid-task.

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If you change something that affects marking (the marks, the correct answer, the mark scheme) and publish, work already submitted is flagged for re-marking. See Remark free response questions.

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