Hello neha,

You can get your CMAT application number by going to the official login page and then clicking on forget application number, you have to just follow some steps and after that you can easily get back your application number,

You have to provide your father name, candidate name, date of birth  and security pin and after that you will regain your application number.and please once you get the application number please save it somewhere so that you don't have to worry about it in the future.

I hope it helps.

Best of luck