Dear student,

The total marks scored by a student in the 12th boards or equivalent is in the top 20 percent of the scorers then the candidate falls in the top 20 percentile. You haven't mentioned your board, i'll assume that you are from cbse. Every year cbse releases the cut off to be in top 20 percentile which is around 420 marks out of 500 for general category students, it is lower for reserved categories. To calculate the top 20 percentile, you should consider The marks of 5 subjects – Physics, Chemistry, Mathematics, Language, Additional subject – in aggregate.

If you have more than 5 subjects consider the best 5 out of them with Physics , Chemistry, Mathematics, Language as compulsory subjects.