1. Disadvantaged pupils are doomed to do badly in school
Results show that the 10% most disadvantaged 15-year-olds in Shanghai have better maths skills than the 10% most privileged students in the United States and several European countries. Children from similar social backgrounds can show very different performance levels, depending on the school they go to or the country they live in.
Education systems where disadvantaged students succeed are able to moderate social inequalities. They tend to attract the most talented teachers to the most challenging classrooms and the most capable school leaders to the most disadvantaged schools, thus challenging all students with high standards and excellent teaching.
2. Immigrants lower results
Integrating students with an immigrant background can be challenging. And yet, results show no relationship between the share of students with an immigrant background in a country and the overall performance of students in that country.
Even students with the same migration history and background show very different performance levels across countries, suggesting that where students go to schools makes much more of a difference than where they come from.
3. It’s all about money
South Korea, the highest-performing OECD country in mathematics, spends well below the average per student. Educational expenditure per student explains less than 20% of the variation in student performance across OECD countries.
For example, students in the Slovak Republic, which spends around $53,000 per student between the age of 6 and 15, perform on average at the same level at age 15 as the United States which spends over $115,000 per student.
4. Smaller class sizes raise standards
Everywhere, teachers, parents and policy-makers favour small classes as the key to better and more personalised education. Reductions in class size have also been the main reason behind the significant increases in expenditure per student in most countries over the last decade.
And yet, results show no relationship between class size and learning outcomes, neither within nor across countries. Rather than putting money into small classes, they invest in competitive teacher salaries, ongoing professional development and a balance in working time.
5. Comprehensive systems for fairness, academic selection for higher results
There is a conventional wisdom that sees a non-selective, comprehensive system as designed to promote fairness and equity, while a school system with academic selection is aimed at quality and excellence.
None of the countries with a high degree of stratification, whether in the form of tracking, streaming, or grade repetition is among the top performing education systems or among the systems with the highest share of top performers.
6. The digital world needs new subjects and a wider curriculum
In short, the modern world no longer rewards us just for what we know, but for what we can do with what we know. Many countries are reflecting this by expanding school curriculums with new school subjects. The most recent trend, reinforced in the financial crisis, was to teach students financial skills.
But results show no relationship between the extent of financial education and financial literacy. In fact, some of those education systems where students performed best in the assessment of financial literacy teach no financial literacy but invest their efforts squarely on developing deep mathematics skills.
More generally, in top performing education systems the curriculum is not mile-wide and inch-deep, but tends to be rigorous, with a few things taught well and in great depth.
7. Success is about being born talented
The writings of many educational psychologists have fostered the belief that student achievement is mainly a product of inherited intelligence, not hard work.
The findings from PISA also show this mistaken belief, with a significant share of students in the western world reporting that they needed good luck rather than hard work to do well in mathematics or science. It’s a characteristic that is consistently negatively related to performance.
Teachers may feel guilty pushing students who are perceived as less capable to achieve at higher levels, because they think it is unfair to the student. A comparison between school marks and performance of students in PISA also suggests that teachers often expect less of students from lower socio-economic backgrounds. And those students and their parents may expect less too.
This is a heavy burden for education systems to bear, and it is unlikely that school systems will achieve performance parity with the best-performing countries until they accept that all children can achieve at very high levels. In Finland, Japan, Singapore, Shanghai and Hong Kong, students, parents, teachers and the public at large tend to share the belief that all students are capable of achieving high standards.
One of the most interesting patterns observed among some of the highest-performing countries was the gradual move away from a system in which students were streamed into different types of secondary schools. Those countries did not accomplish this transition by taking the average and setting the new standards to that level. Instead, they “levelled up”, requiring all students to meet the standards that they formerly expected only their elite students to meet.
In these education systems, universal high expectations are not a mantra but a reality.