Germany (and many other european countries) has the idea of a trade school, in which one learns a trade. Usually these are combined with working experience in the form of apprenticeships. In my experience, continental europe has far more emphasis on early work experience compared to ango-saxon countries. An internship usually lasts a couple of years, people get payed a wage for the work they do and it is combined with schooling.
A plumber would be a prime example of the vocation which is using this kind of system.
people finish secondary education at an earlier age then in the US (16 or even 15 in some cases), then they transfer into tertiary education in a fachschule.