The ERC has published a follow-up report drawing on TIMSS 2019 data which explores the areas in mathematics and science where students in Ireland perform particularly strongly as well as the areas where they do less well. The report can be downloaded here and Appendix Tables here.
The Trends in International Mathematics and Science Study (TIMSS) is a project of the International Association for the Evaluation of Educational Achievement (IEA). TIMSS assesses the mathematics and science achievement of students in the Fourth and/or Eighth grades (equivalent to Fourth Class and Second Year in Ireland). The study also collects detailed information about curriculum and curriculum implementation, instructional practices, and school resources.