Dear student,

To calculate your marks for class 12 you need to consider the best 5 scores,  i.e. consider any 5 subjects in which you got highest marks but English is mandatory to be considered. So you need to consider your marks in English and other 4 subjects in which you scored the highest. For example you scored lowest in mathematics then you need not consider it's score. Take the other 5 scores and add them up and then divide by 5 to calculate your final Percentage.