additionally costa rican students are more likely than their peers in oecd countries to arrive late skip a lesson or miss a full day of school according to selfreported data in pisa about of yearold students reported having missed at least one full day of school in the two weeks prior to the pisa test compared to just in oecd countries about of students in costa rica are in schools where principals consider that the shortage of educational materials eg textbooks it equipment library or laboratory material hinders a lot student learning in their school which is one of the largest proportions among pisa participating countries see figure