This paper provides an overview of tracking policies in secondary education in France. Drawing on two large datasets on educational trajectories and labour-market outcomes, it identifies patterns of social inequalities associated with track allocation in secondary education. It assesses the long-term consequences of track assignment and its mediating role in the association between social origin and occupational outcomes. Results confirm the large association between social origin and track allocation on the one hand, and between track attainment and higher education and labour-market outcomes at occupational maturity on the other hand. We also find that track attainment accounts for a large share of the association between social origin, measured either by parental education or by social class, and outcomes at occupational maturity. These results highlight the importance of tracking policies for social stratification in the French context