Although several studies investigate the effects of school resources on student performance, these studies tend to focus more on intervention effect sizes than on their cost-effectiveness. Exploiting policy-induced variation in Denmark and using high-quality administrative data, we investigate the effects of a school intervention that introduces structured student career guidance in lower secondary school on upper secondary school admission. Disregarding the sunk-cost of implementation, the reform was cost-neutral. In a difference-in-difference framework we find that the reform increases admission to upper secondary school between 4.0-6.3 percentage points for immigrants, but shows at best small improvements for the native students.