There would be a procedure for resetting your password at JEE Mains Website using security questions that you filled during registration process or by getting passcode at your registered phone numbers and email id.
These are not so major issue and I will suggest after resetting your password do write it somewhere for future reference as password syntax is quite complex and you can't fill a simple password to remember rather you have to fill the pattern wise password like one special character, one upper letter...etc thus writing it somewhere would be beneficial for you in future.

Happy JEE

Hi Chaitanya 

never worry about the problem just go to the official website of jeemains and click on the tab forgot my password you will be getting three options which you can select from according to your discretion.

using security question and its answer you choose during filling of the application form

using a verification code sent via text message (SMS) to your registered mobile number

using a link sent via email to your registered email address.

https://jeemain.nic.in/jeemainapp/root/accountrecovery.aspx

here above is the link to the account recovery 

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