I have seen one person successfully challenge an exam this year. (there is a big problem going on with the OU the past 2 -3 years with exam marking some students dropping 3 grades or more, and it is across more than one faculty. ) It's not just you.
But there is a procedure to follow (all universities by law have to have this appeals process)
Stage1: fill in a Query Module Results Form:
http://www2.open.ac.uk/students/help/topic/policies-and-complaints/category/complaints-and-appeals(the complaints process is not that clear, so if you have any queries, phone your Regional Centre or contact the student casework office, who are more helpful in my experience).
Stage 2: if that is rejected send in a letter of complaint to Student Case work office
if that is rejected then there is a third stage
(and finally, if the OU rejects all the stages then there is the adjudicator (a government organisation for education) but the OU has to give a special letter to submit to the adjudicator.
If you appeal, have a look at Which, to see how to lay out your appeal, I think they have a template.
The OU do not do double marking, only single, I think this is one of the problems (A course team chair person stated its because of the costs).
Hope this is helpful
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