ya there is a procedure but result % are predecided. so after completion of checking our papers they see how much result is der.. if it is more than predecided result than they chose a subject and cut about 5 to 10 marks of all students who have passed in checking.. after that also if desired % of result is not found than they again cut marks from students result who have passed from previous mass cutting.. so we never get our desired result.. this is the procedure i know