sample.csv

Roll No.,Physics,Chemistry,Maths,Computer
1,56,57,58,59
2,23,24,25,26
3,89,25,26,27
4,45,26,27,28
5,23,27,28,29
6,90,,29,30
7,12,13,14,15
8,78,14,15,16
9,,15,16,17
10,45,16,17,18
11,,17,18,19
12,88,,19,20
13,22,23,24,25
14,90,,,42
15,,43,43,43
16,44,44,44,44
17,45,45,45,45
18,46,46,46,46
19,47,47,47,47
20,48,48,48,48
21,49,49,49,49
22,50,50,50,50
23,51,51,51,51
24,52,52,52,52
25,53,,,53
26,54,33,33,54
27,55,34,34,55
28,56,35,35,
29,57,36,36,66
30,58,37,37,43