student post pre class1 class2 class3 class4
1 31 22 1 0 0 0
2 30 21 1 0 0 0
3 33 23 1 0 0 0
4 31 22 1 0 0 0
5 25 18 1 0 0 0
6 32 24 0 1 0 0
7 32 23 0 1 0 0
8 30 20 0 1 0 0
9 31 22 0 1 0 0
10 23 17 0 1 0 0
11 22 16 0 1 0 0
12 21 15 0 1 0 0
13 30 19 0 0 1 0
14 21 14 0 0 1 0
15 19 13 0 0 1 0
16 23 17 0 0 1 0
17 30 20 0 0 1 0
18 31 21 0 0 1 0
19 20 15 0 0 0 1
20 26 18 0 0 0 1
21 20 16 0 0 0 1
22 14 13 0 0 0 1
23 28 21 0 0 0 1
24 . 12 0 0 0 1