Please mention the exam you are talking about so that we can help you better. It's probable that you would have got an email from the Institute at the time of application. Find that in your mail. Else use the forgot password option in your login and get your OTP.

If you have forgot your Login password. Then you can try to get new password by clicking the forgot password section provided below the login section. So click on that you can change password which will be sent to you to your registered mobile number or registered email id. So by following this you can change your password and login again.