In the democracies of today, school often have a dual role to play. Not only should they give students the knowledge they need to enter the labour market, they should also teach young people about democracy, and develop students' capacity to exercise their citizenship. A third task for schools is to enhance political equality in society by supporting the least privileged students. In this study, we explore how school can contribute to increased equality by strengthening students' political efficacy. Upper secondary students' political efficacy levels are compared over time by creating four groups on the basis of their educational choices and experiences of the school and teaching environment. The results indicate that school matters for the development of political efficacy, but not in the same ways for all students. Signs of there being compensatory effects of having a positive school/teaching environment are found for students on vocational programmes, but not for those on academic programmes. Moreover, the results suggest that classroom/teaching factors play a more important role than the social environment offered by schools.