Certified Kubernetes Administrator: https://www.cncf.io/certification/cka/
Exam Curriculum (Topics): https://github.com/cncf/curriculum
Candidate Handbook: https://www.cncf.io/certification/candidate-handbook
Exam Tips: http://training.linuxfoundation.org/go//Important-Tips-CKA-CKAD
Head over to this link to enroll in the Certification Exam. Remember to keep the code - 20KODE - handy to get a 20% discount while registering for the CKA exam with Linux Foundation.