I am a CNCF certified Kubernetes administrator now.
I did not clear the exam in the first attempt, came close to clearing in the second attempt, did a horrible docker mistake in my third attempt. In my third attempt I ran a sleep 3600 when with -it flag flag on for docker run, and I could not exit or kill the shell.
Finally, cleared the exam in my fourth attempt. It is fun a exam for someone interested in Kubernetes to take.