I just got my CKA exam score, and wanted to share some experience.
Resources:
- kodekloud CKA course
-
Kubernetes.io site
Kodekloud course was really enough! More than enough! it gaves you all the knowledge you require to get preared for the exam.
Practice for exam:
To get prepared for the exam, I practiced mock exams in Kodekloud multiple times. To get familiar with the exam environment, I practiced in killer.sh session which was available after buying the exam. Actually the questions there, are harder than the exam questions. The questions in kodekloud mock exams were enough for me. I also had a look at killercoda scenarios. There, you can find few scenarios, which are good to solve.
After all, thanks to Kodekloud 
