translate English to French: As would be expected, there were relatively large changes in attainment for the youngest age cohorts (Cohort A), and smaller changes among older cohorts (Cohorts, B, C and D).
Comme on pouvait s’y attendre, il y a eu des variations relativement importantes des niveaux de scolarité pour les cohortes d’âge les plus jeunes (cohorte A), et des changements plus faibles chez les cohortes plus âgées (cohortes, B, C et D).