We evaluate the short-run impact of a mathematics camp for gifted high school students. During the camp, studets work in teams, trying to solve advanced mathematical problems with the help of manipulatives. We randomize participation in the camp and test the effects of such participation on problem-solving skills, personality traits, and career intentions. Results show that participants improve their problem-solving skills, especially in questions that require the use of logic. We also find positive effects on students’ personality traits: students declare to be less neurotic and more extroverted. Gifted students with relatively lower school math scores benefit more from the program. Finally, participating in the mathematics camp makes students more willing to go to university.