hey manish !

in du percentage is calculated by taking the best of four ie, chose any 4 subjects in which you got the best marks . however there are some rules of calculating best of 4 .the best of four must include the subject in ehich you want to get admission which you haven't mentioned it in you question however if suppose you wabsc chemistry hons then your best of 4 comes 63

it isquite difficult to get admissions at this college but i will suggest you to go through these links

https://university.careers360.com/articles/delhi-university-admissions-how-calculate-best-of-four-marks

and also check out the last year cutoffs

http://www.du.ac.in/cut-off.html

best of luck dear