Hello dear student, 

Greetings! 

You haven't mentioned the exam whose password and user id , you have lost ,  I can't help you with this,  as We don’t have access to your account and thus can't provide you , your user id and password,  only the student has access to these things. 

If there's a section like forgot registration or user ID , go through that and answer the security questions and once you answer them correctly,  you will be able to retrieve your ID.

THANKYOU