Before the applicant is qualified to take the Licensure Exam, he must be certified by his Aviation Employer to have spent at least two (2) years hands on On-the-Job Training (OJT). Basically, he must learn the rudiments of performing "Aircraft Maintenance Inspections and Repairs".
He can specialize on Sheet-metal / Airframe and Power-plant, repairs and overhaul. Normally, an Aircraft Mechanic License would show the various types of aircraft he is rated on. He then can "sign-off and release" an aircraft for flight. Or, he can be authorized to do engine run-ups and taxiing. Regular "In-house Training" or "Recurrency Training" will further enhance his skills as an Aircraft Mechanic.
Lufthansa Technik Philippines also provides various trainings not only for their employees but also for other GENAV companies.
Pilots rely on the expertise of his mechanic. There should always be no room for error. It is an exacting job and very much in demand here and abroad!