occasion
0 = year 1 semester 1
1 = year 1 semester 2
2 = year 2 semester 1
3 = year 2 semester 2
4 = year 3 semester 1
5 = year 3 semester 2

job status
0 = no job
1 = 1 hour
2 = 2 hours
3 = 3 hours
4 = 4 or more hours

pupil gender
0 = male
1 = female

0 = no
1 = yes