I've been reading Off the Clock: Moving Education From TIME to COMPETENCY by Fred Bramante and Rose Colby. It's a compelling read that causes you to question just about everything that contributes to our outdated education model.
The 20th century model of delivering content inside of classrooms during specific times is so highly flawed that it will never work the way it needs to work, but we continue to put in an honorable yet futile effort into trying to make an outdated system better.
Schedules drive schools -- daily schedules, yearly schedules, and examination schedules -- all are part of the current framework. In order to move to 21st century learning, we must first begin by deconstructing the elements of the 20th century model of school structure and operation. We must deconstruct the elements of the framework that obstruct the natural process of teaching and learning.