What prompted me to prepare for the exam:
After retiring from my previous company, I decided to change my career path to become an infrastructure developer, distinct from my previous role as a backend developer. My interest in Kubernetes, which can use Docker as a runtime, was piqued because of my prior experience with Docker at a different company.
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My background includes:
2 years and 6 months of experience as a backend developer
Basic knowledge of Linux
Basic understanding of Docker
Holding a GCP certification
Exam Preparation:

Payment:
I paid the exam fee using national support, and I was able to enjoy a 15% discount by using a coupon provided in the course. The total cost was $335.75.

Study Method:
Course: I enrolled in the "Certified Kubernetes Administrator (CKA) with Practice Tests" course, which included lectures and practice tests. I highly recommend making the most of the Udemy Labs provided in this course, as your success in the exam may depend on your proficiency in using these labs.
Review: It is advisable to review lightning labs and take mock exams 1/2/3 repeatedly before the actual exam. Udemy often offers discounts on courses, so consider purchasing the course during a sale.
Language Barrier: Since the lectures are in English, I recommend using the Video CC Translator Chrome extension if English is not your first language.
Study Materials:
Book: To supplement parts of the course I didn't fully understand due to the language barrier, I referred to the book "Kubernetes in Action." The book is extensive (approximately 900 pages), so it took me about a week to read it once. While reading, I marked key keywords and revisited them when I forgot specific concepts.
Study Period:
As I was unemployed at the time, I had more time than office workers, so it took me a month to prepare. This extended period was partly because I lacked basic background knowledge. If you're in a hurry, you may choose to focus solely on lab practice without the lectures and books, but that may result in less retention of knowledge in the long run. I didn't just study for the exam; I used it as motivation to study diligently. Keep in mind that study methods can vary depending on your goals.
Study Timeline:
Weeks 1 and 2: Listening to and organizing Udemy lectures.
Week 3: Completed reading the book and processed the index.
Week 4: Focused on solving labs, lightning labs, and repeated practice of mock exams 1/2/3.
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Exam Difficulty:
The difficulty level of the actual exam was not significantly different from the lightning labs and mock exams. The types of problems were similar to those encountered in the labs. It's important to note that during the exam, you can search for resources on the official website, so being proficient in searching for frequently used items is essential. As of January 12, 2023, my testing experience was smooth with no major loading or interruption issues.
References:
I found the following blog posts helpful in preparing for the CKA exam:
[Kubernetes/CKA] CKA test review on June 28, 2022 (New Proctoring Platform PSI Bridge)
Certified Kubernetes Administrator (CKA) certification passing review and useful tips (2022.02, v1.23)
Review of CKA: Certified Kubernetes Administrator
https://educatorpages.com/site/MangaManga/pages/top-quality-fortinet-nse5-edr-5-0-dumps
Review of passing the CKA certification + summary of how I prepared
K8s CKA acceptance review (September 2021)
Final Thoughts:
I was motivated to study hard for the exam by having already paid for it and by creating an environment that left me no choice but to work diligently. During my preparation, I also took the opportunity to learn more about Linux. I not only studied Linux but also built Kubernetes and transformed previously developed programs into Docker containers to create infrastructure. I documented my progress on Velog for future reference. This comprehensive approach helped solidify my understanding, ensuring that the knowledge stayed in my memory.