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Education systems across the globe have long been organized around age-based grade levels, in which students progress through a standardized curriculum according to their year of birth rather than their demonstrated mastery of specific skills. Critics of this model, sometimes called the factory model of schooling, argue that it forces teachers to instruct toward an imagined average student, inevitably leaving faster learners under-stimulated while slower learners are pushed forward before they have consolidated foundational knowledge. In response, a small but growing number of schools, particularly in parts of Scandinavia and New Zealand, have experimented with competency-based or mastery-based models, in which students advance through material only after demonstrating proficiency, regardless of age or the traditional academic calendar. Early evaluations of these programs suggest mixed but generally encouraging results: students in mastery-based mathematics tracks have shown modestly higher retention of core concepts one year later compared to peers in conventional classrooms, though gains in subjects requiring more open-ended interpretation, such as literature or history, have been less pronounced. Implementing such systems, however, poses substantial practical challenges. Teachers require extensive retraining to manage classrooms in which students work on different material simultaneously, and schools must invest in more sophisticated tracking software to monitor individual progress across dozens of discrete competencies. Furthermore, parents and university admissions officers accustomed to conventional grade levels and transcripts sometimes struggle to interpret competency-based records, complicating the transition to higher education. Critics also worry that without careful design, mastery-based systems could inadvertently widen achievement gaps, as students from under-resourced households may lack the additional support needed to progress at their own pace. Despite these obstacles, several education ministries are now piloting hybrid models that retain grade-level cohorts for social and developmental purposes while allowing curricular pacing to vary by subject.