hi sir,

you may apply in Delhi University y filling the forms which will become online in 2nd week of may april and will stay till 2nd week of june (tentative). 

after you apply,du will release many cut off lists and then according to your result you can get admission in different colleges of DU.

i m attaching a link here, this will further guide you.

https://university.careers360.com/articles/du-application-form

have a nice day!