Links from school and university websites have high value, because these are trustworthy domains that link rarely and only to genuine partners. They cannot be obtained by purchase, but through real cooperation: the company becomes a partner for work placements or dual education, provides a topic for a thesis, gives lectures to students, supports a competition or scholarship, or cooperates on a research project. The link tends to be a by-product of such cooperation; its main benefit is access to future employees and to expert capacity, which matters more for companies in shortage professions. It is worth approaching a specific department or the responsible teacher, not the school's general contacts, because that is exactly where decisions about the website's content are made.
See also: Collaboration with a university, Dual Education, Recruitment in shortage occupations.