Hey

No you can't include 2 language subjects in best of four percentage. The criteria for calculating best of four percentage is based on taking 1 language subject and 3 elective subjects into consideration. The subjects are to be chosen from list A and list B which is prescribed by the university. Only in the case of elective language, it will be treated as academic or elective subject.

To know in detail about how to calculate best of four marks, refer the link below -

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

Thanks