Columns:
    - (beginning of) Neptun code
    - final mark
    - practice mark
    - theory mark
    - theory score
    - theory score for the individual questions (x: no answer)

A3....  4   5           2   18  3022421x4x
AU....  4   3           4   29  3344034242
GC....  2   2           2   18  xx334xx314
GK....  1   1           1   11  4x30020101
H.....  4   4           3   23  xx44344x4x
J.....  5   4           5   36  3434444424
O.....  1   ?           1   19  x3x1x4x344-invalid
P.....  1   2           1   11  xxxxx434xx
X.....  2   (prev:2)    2   19  34x4xx4x4x
Z.....  3   2           3   24  4x4223x414