Regrade Attempts in Bulk
Navigate to Course Admin > Quiz > Click the carat next to the menu title > Click Grade
Click on the Questions tab
Select Update All Attempts
Click on the question you want to give credit for
Under the Grade > Grading Type section, enter the number of points you want to give the students for the question.
If desired, you can add a comment. Once you have completed your edits. Click Save and on the confirmation screen click Yes.
Regrade Individual Attempts
Navigate to Course Admin > Content Page
Under the completion summary, click on the student's attempt that you want to regrade.
Scroll down to the question you want to regrade and enter the points you want to give for the question. Note: you can add to the question feedback a reason why the question was regraded if desired
Once done, click publish in the lower right corner to update the student's grade.