Question: how to calculate percentage of marks of 10th class west bengal?
Answer: By taking "Best Of Five", composed of 2 languages and 3 compulsory elective subjects, i.e the first 5 subjects.
By adding marks of all 7 subjects and dividing that by 7.
By adding marks of Environment & Optional subject + marks of any 3 subjects among the remaining 5 subjects,and dividing the total by 5.