If you registered yourself once for JEE 2025 you cannot register again with same mobile number and email id thats why its said account with same credentials already exists.

You need to recover your application number try recovering through your phone number or a recovery Gmail account or another registered device which you used at the time of registration they send application number on your registered device.

Here is the link for JEE 2025 registration you get all information here about registration of JEE if you have any doubt just click link

https://engineering.careers360.com/articles/jee-main-application-form

It is unfortunate, though that you have to face this. One loses his/her application number, but it can be retrieved if one goes about it through these simple steps.

How to Recover Your Application Number:

Scan through your emails concerning the JEE Main application. It most probably goes with these, so check those first.

Scan through your spam or junk folders.

Visit the NTA portal and see if it is possible to retrieve your application number.

You may also have to provide additional information as your name, date of birth, and registered mobile number

Call NTA Helpdesk:

Call on NTA helpline for direct assistance.

Be prepared to provide your name, date of birth and other information to prove your case.

Clearly mention your problem and seek them to help you to retrieve your application number.

Further Information :

Be Patient and Persistent: The recovery process may take some time. So, stay calm and persistent in your efforts.

Ensure You Provide Correct Information: Ensure that you provide correct and complete information to the NTA so that the recovery process will become easier.

Maintain a Record of Important Documents: Moving forward, maintain a record of important documents such as application numbers, admit cards, and scorecards in a safe place.

Pass through these and remain calm as you will obtain your JEE Main 2025 application number in case the issue persists, report to NTA or the concerned authorities.