Hello Student ,Find out the official website of the respective Examination Authority. Then seaarch for the recovery option for roll number. Then put it your application number and password. Click on the respective format or option for the exact roll number you have got at the time of form fillup.

.  For  confirmation of the application form fillup there will be message consisting of registration number also. Searching from this email ID and get the registration number and for duplicate admit cardyah to search on the official website by putting your name father's name address exam name date of birth the date you filed up of the application.There will be option for download duplicate admit card click on the option and get the duplicate admit card .   where you will get the registration number .

Hope this helps