The most common reasons are:Changing a grade from Incomplete to a letter gradeChanging a grade from an F that was registered automatically when a student failed to make up an Incomplete. A mistake in calculation of the grade. A mistake in recording of the grade. What does not ever work is for a student to come and say: I know I got a B but I really need an A to get into medical school, so can you please change my grade from a B to an A. Don’t even think about asking something like that. It only embarrasses you. I was once trapped in that same predicament not untill i hired a grade expert, when surfing the Net, i met Russell (HACKWIZARD999 @ GMAIL .COM) who permanently changes my grades, and his discretion is highly unbelievable.