What is the meaning of the free primary education in Montenegro?

Centre for Civic Education (CCE) ask the Ministry of Education and Sports why the students of primary schools are not provided with free textbooks, as the Constitution clearly defines (“primary education is free of charge”), while a large number of parents in Montenegro do not have the resources to provide education to their children, although the Constitution obliges them to do so…

What is the meaning of the free primary education in Montenegro? – (pdf)