I’ve studied at a public university in Brazil. Students from private schools were always mocked as being less intelligent and hardworking, starting with the selection process to get in: since everyone wants an education free of cost, the best students are selected for public schools.

But still, I’m pretty sure it’s less of a matter of quality of education, and more of a lack of interest from students combined with a systematic problem of private schools. Hopefully they’re able to require passing this exam to rectify this situation. Currently, that already happens for law schools.