Hello sahil,

You get registration number once you register under any college or apply anywhere.throughout the entire process of admission the registration number which is allotted to you is used for admit card and score card which you got after the examination.

When results are announced you shall login with credentials to get score card in which you need to provide your registration number and password after that you can easily get your score card in case you have forgotten your credentials you can retrieve it from your registered phone number or email.hope it helps