failures - number of past class failures (numeric: n if 1<=n<3, else 4)

Dalc - workday alcohol consumption (numeric: from 1 - very low to 5 - very high)

Walc - weekend alcohol consumption (numeric: from 1 - very low to 5 - very high)

G1 - first period grade (numeric: from 0 to 20)

G2 - second period grade (numeric: from 0 to 20)

G3 - final grade (numeric: from 0 to 20, output target)