Can I add the marks of physical edu. (an additional sub.) in top 4 sub.??? Pls ans. Me

Yes, you can surely add the marks of physical education in your best four score. (I am considering Delhi University)  But the only limitation is that on inclusion of this subject (physical education ) there is a deduction of 2.5percent from your best four.

For example: marks in respective four subjects considered for best four:
English -95
Political science- 94
History 97
Physical education - 99
Best four calculated - (95+94+97+99)/400 * 100 i.e.96.25

For admission purpose score will be considered as 96.25 - 2.5 i.e. 93.75
Hope this helps.