My "Secondary School" was from 13 to 18 (6 years). https://es.wikipedia.org/wiki/Educaci%C3%B3n_Secundaria_T%C3... You had one additional year than a normal "Secondary School" here, it [1] includes normal classes in the morning but less History/Geography/Whatever and in my case more Chemistry, a lot of Chemistry. Half of the days in the afternoon we had practical classes, making Chemistry experiments. At the end, I get a the "Secondary School" degree that enables me to go to the university and also some official habilitation to run a small chemistry factory or laboratory (oversimplifying the legal details) (probably is more accurate to say that I can supervise a few persosns in a factory or a lab).
Other students instead of Chemistry classes had Masonry classes and got an habilitation to build a small house (up to 2 stories?) and other Electronic classes, ... Each School has a different specialization, a bunch of specializations.
Edit: [1] The last 4 years. And the first 2 years have also more technical classes than a usual school, but they mix other stuff like basic electricity or metalworking.