Exams are offered at Apple Authorized Training Centers worldwide.
Three Steps to Certification
1. Choose your certification path.
2. Select a location: Apple Authorized Training Centers offer all exams (OS X, Pro Apps, and iWork) even if they don't offer the associated course.
3. Register for and take your exam(s).
How do I register for an Apple Certification exam?
Contact an Apple Authorized Training Center (AATC) in your area.