Hy nisha, 

Du is one of the most highly ranked prestigious insttitue of government in delhi.

Clearing du cut off are really tough as maximum course have cut off 90+ in du colleges.

So depending on your course and students the cut off is decided. Basically the seats gets almost filled up for most courses in 6th cut off and few remaining seats depends on your caste category. 

But still, hardly a difference of 2 to 3% cut off gets reduced from 5th to 6th cut off as all colleges close up their admission as no vacancy remains. 

Still depending on course and college and your marks you can wait if you lack by 1 to 2% marks.

Good luck.