Enrollment is limited; each year the institution establishes the number of places available. This is called the "numerus clausus". For the public institutions the exam scores count for the final evaluation, which includes the secondary school average marks. Then the students have to choose six institutions/courses they prefer to attend, in preferential order. The ones, who reach the marks needed to attend the desired institution/course, given the attributed vacant, will be admitted. This means that the students could not be admitted at its first or second choice, but be admitted at the third or even sixth choice.