hey kunal

the calculatuion of the best of 4 remains early same for the students of other board students however there is some minute changes . so here is the whole procedure of calculating the best of four . click the link below

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

you can predict ehich courses you can get in du by observing the previous years cutoffs . it can give you a better picture of the college and courses you can get

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

best of luck