Objective quiz questions are automatically graded based on the correct answers provided when quiz questions were created, but written response questions must be scored manually. All question scores and feedback (whether initially scored automatically or manually) can be updated.
Quiz questions can be changed to bonus questions after students have submitted attempts, but the steps are different if the quiz and grade item were created with the same maximum points or different maximum points.
There may be cases where scores for a question for SOME students need to be changed after the questions have been autograded.
There may be cases where scores for a question for ALL students need to be changed after the questions have been autograded.
Note: The quiz questions should also be edited to select the correct answer so that future students are scored appropriately on the item.