Hello Piyush! Here is some feedback from others in the community that I think you will find useful:
Kubernetes the Hard way helped him as well. He also ensured that he could solve all the exercises and exam prep questions from the CKA course in about an hour (he recommends trying to time yourself). He also recommends reading the handbook (https://www.cncf.io/certification/candidate-handbook).
He goes on to say that during the exam, use editors that you are familiar with (vim or nano). You are allowed to use kubernetes.io/docs during the exam but only 1 extra tab is allowed for it.