Thanks to @Mumshad Mannambeth and the study group here, I managed to complete the CKA certification yesterday.
One important point from the online exam is to be familiar with their environment. Use the aliases in the Kubernetes cheat sheet. For those who do not like the vi syntax highlighting, turn it off by putting the liner “syntax off” in the .vimrc file. I had difficulty reading the faint colored words.
Good luck to all who are taking the exam soon.