however in the czech republic denmark iceland luxembourg the netherlands poland and switzerland more than of yearolds are still enrolled in secondary education these high shares may partly be explained by the structure of the education system and the strength of the labour opportunities offered by vocational upper secondary programmes in these countries making them more attractive than tertiary education enrolment of yearolds in tertiary education averages across oecd countries ranging from in luxembourg the low share is due in large part to the high number of students studying abroad and in iceland to in korea