since you have a very good aggregate, you can apply for colleges in DU and hence log on to the site mentioned below and feed in the details first logging in to the site after which they will generate the log in credentials.

next, keep your extra curricular certificates (ECA) if you have any

http://www.du.ac.in/du/index.php?page=ug-admission

the top colleges being 

khalsa college

daulat ram

atma ram 

saint stephens 

hansraj

gargi and such

all the best