Hey Sumit

The steps you need to follow to register for DU are:

First- You have to visit http://admission.du.ac.in/

Second- New Registration then Create New Account

Third- enter the your name as mentioned in class XII Board Roll Number.

Fourth- Enter your  email-id and confirm, choose the security question, create a password and provide a valid mobile phone number

Fifth- after registration you have to use Registered Applicant Sign In after which you have ti fill in your personal details (like aadhar card, category etc)

Sixth- Fill your Academic details and then your bank details. Then select the courses in merit  based and exam based portal. Then upload your photo, marksheet etc and complete the payment.

As for the cutoffs and college prediction you can visit