Belgium scored higher than the OECD average in science in PISA 2015, with a mean score of 501 points, compared to the OECD average of 493 points. Performance in science remained stable across PISA cycles, with an average score change of -2.7 score points, while reading performance has stayed the same and mathematics performance has decreased. Socio-economic status had one of the largest impacts among OECD countries on science performance in PISA 2015, explaining 19.3% of the variance in performance (OECD average: 12.9%). The impact of ESCS on performance in science has not changed since 2006. Gender differences in science performance were among the highest in the OECD, with a difference between boys and girls of 12 points, compared to the OECD average difference of 4 points. Immigrant students made up 17.7% of the student population of 15-year-olds in 2015, higher than the OECD average of 12.5%. Performance differences between immigrant and non-immigrant students are higher than the OECD average. Immigrants scored on average 43 score points lower than non‑immigrants in science in PISA 2015, compared to the OECD average of 31 score points.
Education-only pre-primary programmes with no tuition fees exist in each community of Belgium. A formal curriculum for these programmes is delivered by qualified teachers. Compulsory education in Belgium begins at age 6 and ends at age 18, longer than the typical duration across the OECD. Students are typically first tracked into different educational pathways at age 14, but in some cases as early as age 12, which is earlier than the OECD average of age 14. Upper secondary education has a wide diversity of streams in all education systems in Belgium. All three Communities offer four-year general, technical and vocational streams of education, and the Flemish and French Communities also offer an art education stream. In general, students can access higher education after attending a general, technical or art education upper secondary programme. Vocational streams require the completion of a seventh year of secondary education to receive a secondary school leaving certificate. In the Flemish and French Communities, secondary vocational education can be followed in two strands: purely school-based or dual school‑ and work-based. All five upper secondary education programmes, including dual vocational education, lead to a diploma for secondary education. Only completion of general, arts, and technical secondary programmes provides access to higher education, after four years of upper secondary education. Students in the Flemish and French Communities who complete vocational secondary education receive a secondary school leaving certificate and have access to associate degree programmes only if they complete an extra year, which then can grant access to all strands of higher education, universities and university colleges. In the German-speaking Community, students who complete secondary school receive a leaving certificate and have access to higher education, regardless of the education stream they have completed.
Overall, Belgium has a higher-than-average enrolment rate in school-based VET among OECD countries, with 57% of students aged 15-19 following a VET programme (compared to the OECD average of 40%). The proportion of the population aged 25-64 with lower secondary education as the highest level of attainment in Belgium is higher than the OECD average, with an attainment rate of 16% in 2016, compared to the OECD average of 14.3%. NEET rates (the proportion of those aged 18-24 that are neither employed nor in education or training), are lower than the OECD average, at 12.4%, compared to the OECD average of 15.3%. The share of population aged 25-34 with a tertiary-level qualification is higher than the OECD average, at 44.3% in 2016, compared to the OECD average of 43.1%. Employment rates for 25-34 year-olds with tertiary education are higher than the OECD average. In 2016, 86.8% were employed, while the OECD average rate was 82.9%.