Hello dear student!

If you are asking about the percentage of marks DU will count as per cut off, then , the procedure is different for different courses. For most of the humanities and commerce courses, the marks considered are the percentage of best four. It is unrelatable to the other remaining subjects even if you've  entered it's  marks while  filling up the form. For most science courses, main 3 subjects's marks are usually counted. So check the procedure of the course you want to opt on the official site of Delhi University.