I have a teacher who had three essay questions for a section exam. The quiz was created in Quizzes.Next and each question was to be worth 20 pts. He accidentally marked the last question as 1 pt. and didn't realize his mistake until some students had already submitted their answers.
He was able to change the points value of the question for those students who had not taken the exam, but we're not finding any solutions for adjusting the total points value of the exam for the students who have submitted.