„Grade repetition is used to give students whose teachers believe are not yet ready for more advanced coursework time to “catch up” with their peers. If the curriculum is cumulative and further learning depends on a solid understanding of what had been previously learned, then promoting students regardless of their mastery of the content might put low-performing students in an increasingly difficult position in higher grades.“
OECD (Hrsg.), „The Resilience of Students with an Immigrant Background“ (2018), S. 228