Sistema COC is a learning system for Brazilian private school students attending kindergarten through 12th grade. Its mission is to prepare students for assessments administered by the National Institute for Educational Studies and Research (INEP) of the Brazilian Ministry of Education. The most important of these assessments is the Exame Nacional do Ensino Médio (ENEM), the main Brazilian college entrance exam. In 2001, COC introduced the Simulated ENEM (SimENEM) program, which allows schools and students to demonstrate their preparedness for the ENEM. The SimENEM is offered free of charge to all students in Brazil. Pearson conducted a study comparing SimENEM results for students in Sistema COC schools with similar students in public and private schools not using Sistema COC. The study found that Sistema COC students statistically outperformed other similar non-Sistema COC public school attendees in SimENEM subjects language and natural science by a large margin (by 21 and 17 percentile points). The research team equated comparison groups by matching examinees older than 18, on the previous year's (2017) SimENEM scores, grade level, number of people living in the household and years attending the same school. There were no significant differences in performance between COC students and non-COC private school students in Language, Math, Human Science and Natural Science. [For the summary report, "Sistema COC. Product Efficacy Report Summary," see ED609235.]