INEP's Indicador de N\u00edvel Socioecon\u00f4mico (INSE) classifies schools from Level I (lowest) to Level VIII (highest) based on student family socioeconomic data.
The Exame Nacional do Ensino M\u00e9dio (ENEM) assesses high school students across four knowledge areas plus essay writing. Scores range from 0 to 1000 per area.
Annual school flow rates from INEP. Approval = promoted; Dropout = abandoned; Retention = repeated.