hello aspirant,

I hope that you are doing absolutely great.

With reference to your above mentioned query, I would like to tell you that you can easily retreive your forgotten JEE application number, then you can follow the below mentioned steps :

1. Visit the JEE Main official website - jeemain.nic.in.
2. Click on “Application no.” option.
3. Answer the security question opted at the time of filling the application form.
4. Now enter the Verification Code that is sent on your Registered Mobile Number.
5. Now Reset the Password and Login.

I hope that this will help.