Primary and secondary schooling is combined, so the pupils don't have to change schools at age 13. They avoid a potentially disruptive transition from one school to another.

Teacher Marjaana Arovaara-Heikkinen believes keeping the same pupils in her classroom for several years also makes her job a lot easier.

''I'm like growing up with my children, I see the problems they have when they are small. And now after five years, I still see and know what has happened in their youth, what are the best things they can do. I tell them I'm like their school mother.''

Children in Finland only start main school at age seven. The idea is that before then they learn best when they're playing and by the time they finally get to school they are keen to start learning.

Remarkable.