i tried to register but the site is showing that plz enter roll no application no candidate name mother's name as printed on your admit card. What should I do. I have filled the information correctly. plzz help

Please check each and alphabet while entering. Do enter exactly what is printed on admit card and check for registration.
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If it still doesn't take under registration the you are already registered. Go for login page rather then registration. Do enter the details in login page.
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If still the login page doesn't respond, do mail the helpdesk of the College or examination about your problem they will help you out with the solution