on jee main site will I write my old application number of jee main 2020 or I will do new registration to get a new application numb if I am dropper
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You have to register fresh for JEE Main 2021. You do not have to use the previous application number, it will be invalid. A new application ID will be generated after completing the registration for JEE Main 2021. You need to use the new login credentials to login in the candidate portal, download admit card and check the examination results.
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