I think the OP is Brazilian (submissions include links to blog), in which case Secondary extends to 18, so equivalent to A-level in the UK for example.

Almost. I'm from Argentina. I'm not sure about the translation, and the system has changed recently, so the current information may be different.

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.

Thanks for the correction -- I think the confusion comes from "secondary" which is 11-16 in the UK, so "secondary chemistry" is fairly basic (I have it, and I know nothing of chemistry)