Hello Student

The percentage of marks of 12th class calculated on the aggregate of the total marks of  subjects the candidate got for the examination, not individual percentage of marks out of 100. Suppose the total marks is 500 then the marks he or she get in five subjects will  come into account for calculating the percentage of marks. If a Candidate get a low marks out of subjects taken for 12th examination then the low marks subjects marks will not be in count for percentage of total marks. Only the total marks will be count  and marks  he or she has got in the examination.

Hope this helps.