Hello jyothika, hope you are doing well.. please refer to the link below to know to find out the process of finding the neet user id.. all the process is given in the link

https://www.careers360.com/question-i-lost-my-user-id-and-password-that-was-sent-to-me-on-my-phone-please-tell-me-a-way-to-recover-it-i-have-been-successfully-registered

Hello,

If one forgets their username and password, this question will help verify their identity. Try giving the security answer to your security question and if you give the right answer, you might receive the details to your registered Contact no. and Email. 

Thanku.

Hey Jyothika,

Hope you are doing well!

Well dear you should first check your inbox as many times when the user ID is generated a mail is sent to your registered email ID,also,look if you had made a note of it somewhere.

Else,you may talk to the concerned authorities,they will tell you the further proceedings to regenerate it.

Hope this was helpful!\

All the best!

Keep Smiling :)