On the Class Markbook page you are shown the assessment results for all pupils in a class for all assessments that class has been assigned.
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When you toggle on Analytics you are shown some valuable insights into the results data, including Suggested Areas for Improvement, based on recently completed quizzes or tests.

If, however, you wish to extract the Class Markbook data to a spreadsheet so that you can manipulate it for sharing and printing, you can do so through highlighting, copying, and pasting the data, with a little bit of tinkering in your spreadsheet at the end. Here is a video showing you how: