Machinists/sailors will study in school for four or five months, and only after passing the exam can they obtain the certificate. The third officer/third officer has studied for 2 years, and after passing the examination, the maritime safety administration will issue a certificate. There are many subjects in the exam.
Now the pass rate is very low. In the past, the pass rate of mechanic sailors was above 90%, and after the implementation of the new regulations, it was around 20%. Three pairs and three tubes have always been a dozen to twenty.