„Schools with sufficient teachers can provide after-school care to extend students’ learning time, benefiting their academic achievement. Additionally, schools with adequate teachers can reduce class sizes. When the number of students per class is below 20, the proportion of resilient students increases significantly.“
Univ.-Prof. Dr. Tao Jiang u. a., Typologies of secondary school student academic resilience in science with classroom and school context predictors (2024), S. 10.