Hi arpita, hope you are doing well, you can send a mail to the authorites through the mail id provided int the website of kcet, then you can get a reply from them having your user id and password and thus can successfully login into your account. Try doing this like you check in your emails, when you register they will provide you with an email which has your id and password.

I think it helps you!!!

Keep Smiling:)

Wish you good luck!:)