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We use here zero-one inflated beta models with heteroscedasticity to model the proportion of failed courses in Engineering students at the State University of Campinas, Brazil. We also model the GPA score for those students with a heteroscedastic skew t distribution. The database consists of more than 3000 students with Engineering majors who entered in the University from 2000 to 2005. The entrance exam score (ESS) in each subject, some academic variables and their socioeconomic status are considered as covariates in the models. Diagnostics and residual analysis are performed as well.