Educational system in Denmark consists of: 1. Primary and secondary schools, with primary for ages 6-16 and secondary for ages 16-18 or 19. 2. Secondary schools have lessons that last 45 minutes, a 5 day school week, and approximately 30 hours of lessons per week over a 40 week school year with 6 weeks of summer holiday and other breaks throughout the year totaling 200 school days. 3. Students study mandatory subjects like Danish, math, and science as well as optional subjects. National exams are taken at the end of 9th grade in core subjects and students must pass to advance to further education.