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If you are grading written answers in a Moodle quiz or exam then this method will allow you to grade all answers for the same question on one page.
Step 01 - Select the Quiz or Exam
Step 02 - Select Manual Grading from the Quiz Actions Menu (The Gear Icon)
Step 03 - Select grade all for the question you want to mark
Step 04 - Now grade multiple students answers to the same question