Hi Aspirant 

Here you can know all about DU.The link is given below:

https://www.careers360.com/university/university-of-delhi-delhi

Here you can find a suitable college of your choice.The link is given below:

https://www.careers360.com/university/university-of-delhi-delhi/affiliated-colleges

You may have to give affidavit for your one year gap.

Du offers admission on the basis of entrance exams and merit based.This you can check on the official website of DU.Here by visiting the link.

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

Hope it would be helpful.All the best.