hey,

i hope you are well

while calculating best four subject marks you need to keep following points in mind

1. one language (core/elective/functional)

2. that subject in which you are taking admission let say if you are seeking admission in B.A english hons then you need to include english subject fallacy will bear a deduction of 2.5 percent and if you are from any stream other than arts then also 2.5 percent deduction will be faced.

3. any two subject from list A (link mentioned below) , fallacy will face deduction of 2,5 percent

for more information kindly go through the link mentioned below

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

good luck!