Hello student.

Hope you are doing well.

Whenever you login may be your password doesn't match with the original one then also it shows invalid.

Also for this please match all the digits carefully and log in with correct password.

Sometimes this happens due to lag in the website. But if it is continuing for so long and all your registration number and password are correct then drop an email to the particular exam application you are trying for.

Hope this will help you. Have a great day!

Good luck!!