According to a recent Support Note, Apple on February 25, will post a new set of exams and curriculum for the Apple Certified Macintosh Technician certification. The current (to-be-previous) set will be retired on that date. The new program covers OS X Maverics and recently-released products such as the new Mac Pro, which is finally arriving in customers' hands.
The note says that persons with existing ACMT certifications won't need an update. Persons needing to complete an ACMT certification before February 25, should take them as soon as possible since the current tests will be going away, Apple said.
However, persons who have complete one of the exams don't have to start over but must take one of the new exams.
If you completed the 9L0-010 hardware exam or the 9L0-065 Mac OS X Mountain Lion exam, you can satisfy ACMT requirements by taking one of the new exams. If you completed 9L0-010 for hardware, you can take the 9L0-065 OS X Mavericks exam to complete ACMT requirements. If you completed the 9L0-064 OS X Mountain Lion exam, you can complete your requirements by taking the 9L0-011 hardware exam.
Apple in the summer, moving them online.