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Clicking on the left-hand side sections will show you question and answer view one by one. The arrow button under the progress bar lets you skip to the new section if you wish, or you can use more detailed review mode (recommended). In both views, you can add the flags and comments for the Completer, see more here.
To view the report that was created automatically upon the submission of the assessment you need to go to the assessment summary page. You will find more on reports in here.
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