One of those links, the first, is from a Galicia school. Incidentaly, I am Galician, and I read "O príncipe, de Maquiavelo" when I was around 40.

The difference in Galicia is that we also have "Literatura Galega", that requires us to read Castelao, Neira Vilas, Rosalía, Murguía, Otero Pedraio... I bet other Comunidades with their own language also recommend local writters.

Unless they went to some kind of private school, where they found a weird literature proffesor with political inclinations (the kind that also recommend Gramsci or Rothbard like it is "literature"), or maybe the requirement was from a philosophy or a history class, I never heard such a thing. Not saying that they are lying, but it is not a common recommendation, even less a requirement.