Does the Gap Between the Test Days Help? Evidence From College Entrance Exam in Brazil

College entrance exams are generally administered on the same day or back-to-back days. We ask whether introducing more days to study between subjects improves test scores. Brazil’s college entrance exam, ENEM (Exame Nacional do Ensino Medio), was administered on back-to-back days before 2017, and starting 2017 a six-day gap was introduced between test days. Using administrative ENEM data from 2012-2019, post-2017 the test scores improved by about 5 points per subject (mean score of 515 points ranging from 0 to 1,000 points), with small improvements for males (2 points), whites (6 points), racial minorities (4 points), and those in the middle-income tercile (7 points) relative to those in the other terciles (4 points). The findings point to small performance gains in test scores for additional days available between tests.