Using recent data, this study examines the affirmative action programme of the Universidade do Estado do Rio de Janeiro (UERJ), the first Brazilian university to implement admissions quotas. The article analyses admissions records and finds that both the ratio of applications per place and minimum admission scores are considerably lower among quota students; scores in the admissions test are associated principally with socio-economic factors rather than racial ones; preparatory courses for the university's admissions tests do not appear to be a substitute for the quota system in terms of improving access; few quota applicants would be admitted in the absence of the system; and the applicants who displace others come from disadvantaged socio-economic backgrounds. The article concludes that it is necessary to improve the quality of basic education in Brazil in order to enable disadvantaged applicants to compete.