I want to calculate my best four percentage for DU in BA Prog. I opted PCM English and Physical Education. (MARKS:75,78,81,86and 97)

Hello,
Your best four subjects percentage is 80% including Physics, chemistry, maths and English.
Physical education will not be included in BOF unless you are pursing a course in it.
English is always included in best four subjects percentage.
If I consider previous years record, then the chances to get admission in DU colleges are mild. YOU CAN CHECK THE CUT OFF FROM THE LINK MENTIONED BELOW -
http://www.university.careers360.com/articles/du-cutoff
Hope this helps,
Regards!

This is how best score will be calculated:

97+86+81+78=342
342/400*100
= 85.5%

Since I HV chosen the top scoring marks to calculate your best 4 physical education is included hence there will be deduction of 2.5%
Your final score will be :

85.5-2.5= 83%

All the best.