Hello manisha

The calculation of best of four also depends upon the course in which you want to get the admissions .However you can easily understood how to calculate best of four via this article .

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

You need not to upload your best of four percentile as it will be checked and asked only at the time of counselling .The first cutoffs is announced now so go through the admission procedure also .

If you don't want mathematics ,then you can decide not to include it in your best of four .