Hi, there are certain rules set by DU to calculate your best of four score:

• one compulsory language i.e English
  
• subject in which you wish to take admission
• the rest two academic/elective subjects according to list A
• if the subjects included in best of four calculation aren't mention in list A the 2.5% marks will be deducted from best of four calculation.

In order to check the subjects in list A visit the link: https://university.careers360.com/articles/delhi-university-admissions-how-calculate-best-of-four-marks

In order to check the eligibility criteria of various b.sc courses and the subjects that are needed to be included in best of four, read the article in the following link: https://university.careers360.com/articles/du-bsc-eligibility-criteria

Good Luck