I learned something new as I read about Marie Curie. The word used for high school was Gymnasium and the reasoning was that it was used as a place to 'exercise' the mind in preparation for the rigorous studies ahead at the University level.
That's how I feel about our focus--it's not about mastering content at this level. It's about exercising and stretching a child's learning faculties in preparation for a lifetime of learning. When students graduate from formal schooling, they attend a Commencement ceremony--a commencement of learning. Not a conclusion to it.