Other factors frequently associated with
failing are being over 15 years of age, having more than
one sibling, attending evening classroom/group, having a
low level of motivation to study, to live in a big city (with
more than 20 thousand inhabitants), and students which
consider Math as a difficult subject. It is also striking that
the failing grades for a subject like Humanities, that a
majority of students usually pass, appear in the obtained
models.