Well, unless we fail a grade 
Typical American schooling is Elementary School which is Kindergarten then grades 1-5, Middle School which is grades 6-8, and High School which is grades 9-12. There are variants which move grades around between schools (K-6, 7-9, 10-12 is a common pattern, too).
Aha. First I thought you quit school two years earlier than we do here, but the clusters of Elementary (Middle) and High school are just different
In Belgium we're required to be educated until we're 18, though that doesn't necessarily has to happen in school ...
