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
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