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A decade-long comparison of secondary education systems in three countries with historically similar academic outcomes has produced findings that challenge assumptions about what drives student achievement. Researchers tracked cohorts of students in Lindeland, Kastoria, and Verrenmark from age twelve through university entrance examinations, controlling for household income, parental education, and regional economic conditions. Lindeland, which had implemented a national policy of delaying formal subject tracking until age sixteen, showed the smallest achievement gap between students from the wealthiest and poorest quintiles, though its average top-end performance in mathematics lagged slightly behind the other two systems. Kastoria, by contrast, sorts students into academic or vocational tracks at age eleven based on standardized examination results; its top performers scored highest overall, but the gap between tracks widened each year, and students placed in vocational tracks were markedly less likely to pursue any postsecondary study, even when later testing showed they had comparable aptitude to peers in academic tracks. Verrenmark occupies a middle position, offering tracking at age fourteen with a formal, publicly funded pathway for students to switch tracks after two years; roughly 18 percent of students exercised this option, and those who switched into academic tracks performed, on average, within half a standard deviation of students who had been tracked academically from the start. The study's authors caution against drawing simple policy conclusions, noting that teacher training investment, class sizes, and cultural attitudes toward vocational work varied enough across the three countries to complicate direct causal claims. Still, they argue the Verrenmark model, with its built-in switching mechanism, offers a plausible middle path for policymakers seeking to balance early specialization against the risk of prematurely closing off opportunities for students whose abilities or interests become clearer only after the tracking decision has already been made.