You haven't mentioned whether you have uploaded your 12th marks or not. Because uploading your 12th marks is important for the Rank to be displayed. There are 3 reasons why a rank might not have been assigned in KCET:

1. 12th marks missing
2. You must have marked the code inversion wrong
3. Revaluation of your 12th means your marks must have changed and a new rank needs to be assigned.

But do not worry about it. Login to the KCET official website with your login credentials and upload your QE marks and you will be assigned a rank. But if you have uploaded your QE marks and then not have been assigned a rank, please reach out to the helpdesk from your registered email id: keauthority-ka@nic.in