High dosage tutoring in pre-vocational secondary education: Experimental evidence from Amsterdam ∗ Joppe de Ree † Mario A. Maggioni ‡ Bowen Paulle § Domenico Rossignoli ¶ Dawid Walentek ‖ March 11, 2021 Abstract We present first results from an experimental evaluation of a high dosage math tutoring program implemented in a secondary school for pre-vocational education located in a low-income neighborhood in Amsterdam, the Netherlands. From a pool of 98 students in their first year of secondary school (aged 12-13) 49 were randomly assigned to receive 2-on-1 tutoring. Treated students received one class period of personalized tutoring daily in the first 16 weeks of the school year. Outcome test scores were observed at the end of the first semester and at the end of the school year. We find treatment effects of 0.44 (p< 0.01) and 0.72 (p< 0.01) control group standard deviations after one semester on a verbal math test (with math word problems) and a nonverbal math test (math without textual context) respectively. The results indicate substantial learning gains. On the nonverbal math test, treated students gained statistically significantly more in one semester than control students gained in the entire school year. JEL: H0, I20, I24, I26, J24 ∗ For their various types of contributions to this paper, the authors would like to thank the follow- ing individuals and organizations: Students, teachers and other staff of the school that participated in the research project, Amsterdam University Fund, International Marketmaker’s Combination (IMC), The Bridge Learning Interventions Foundation, Saga Education, Mike Goldstein, Jonathan Guryan, partici- pants of the sociology seminar and the QMSS seminar at the University of Amsterdam and all the research assistants and others – including Isabel Speelman, Shelby Sissing, David van der Duin – who supported our team. † Erasmus University Rotterdam. Corresponding author: joppederee@gmail.com ‡ Universit`a Cattolica Milano § University of Amsterdam ¶ Universit`a Cattolica Milano ‖ University of Warsaw 1