killer.sh is the CKAD exam simulator the Linux Foundation includes with exam registration — two sessions, each with 36 hours of access to a realistic, hands-on environment covering application design and build, deployment, observability, configuration and security, and networking. Candidates consistently recommend it as the closest thing to the real exam environment, and it's often described as harder than the exam itself.
The gap is that a simulator is a test, not a study system: two sessions show you where you stand at two points in time, but they don't teach the material, plan your study, or track readiness across application design and build, deployment, observability, configuration and security, and networking in between.
Edureify's Diagnostic maps your understanding across application design and build, deployment, observability, configuration and security, and networking on day one, and the Readiness Score keeps updating as you practice — so you can walk into your killer.sh sessions already knowing which areas still need work.