Hii, 

The University of Delhi considers the four subjects in which the students scored the best marks in his qualifying examination (10+2 examination). The four subjects the university considers when calculating the best four marks are:

1. One language subject, it can be core/elective/functional

2. One relevant subject

3. Subjects from List A

For  getting information about the list A subject, you can visit the below link :

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

Hope this helped. 

Good luck!