1. Primary-school class sizes for the last four years: data available by primary-school and class-room. The source for this data is the Annual Census of Primary Schools.
2. Retention Rates of Pupils in Second-Level Schools: 1991 to 2001 Entry Cohorts. These data are aggregated but provided on a county by county basis. The overall Leaving Certificate retention rate has increased in the five years between the 1996 cohort and the 2001 cohort: from 81.3% to 84.7%.
3. The State Examinations Commission website has a statistics page providing Leaving Certificate and Junior Certificate grade information for every subject, and by gender, for the years 2000-2010.