Correção de texto: Vestibular

I heard that in U.S they don't use exams to enter at university, just use the grades from high school and compete with oneanother, there is no public universitys where everybody could go by free, but there is so many chances to get scholarships, here, we need to go a exam called vestibular, and compete with many people, there is many diferent ways to enter in university here, exist some university where they accept grades from high school, so you don't need to do vestibular, but only on private universitys, at public university is requared to do vestibular and ENEM, it's so hard cause althought you know the subjects required sometimes you can't interpret the question and be confused and also very nervous, the unique way to enter in public universitys is studying a lot and count with Lucky..