PISA 2025 — Proficiency Distributions

Source: OECD, PISA 2025 Results, Volume I — Tables I.B1.2a.1 to I.B1.2a.4 (mean, standard deviation and percentiles) and I.B1.2a.10 to I.B1.2a.13 (percentage of students at each proficiency level). Science was the main domain in 2025; computational problem-solving was assessed for the first time and is reported on its own scale, so its scores are not comparable with the other three domains. Distribution curves are normal curves simulated from the reported mean and standard deviation. Proficiency level shares are the reported values. The country list changes with the subject: systems that did not take part in a given domain are left out of the menus.