To prepare for an exam, complete the following courses:

Courses Certified Jenkins Engineer
(CJE)
Certified CloudBees Jenkins Engineer
(CCJE)
Jenkins - Fundamentals  ✅  ✅
Jenkins Pipeline - Fundamentals  ✅  ✅
Jenkins Administration - Fundamentals  ✅  ✅
CloudBees Core - Fundamentals  ✅

Register for exams here