Grading scheme:

  %     Points   Grade

 0-50    0-25      5
51-60   26-30      4
61-70   31-35      3
71-80   36-40      2
81-100  41-50      1

Matrikel  1  2  3  4  5  Sum   Grade

0255601   9  0  9  5  0   23     5    (improved to 3)
0556949   4  1  0  0  2    7     5    (improved to 4)
9755293   9  2  0  7  0   19     5    (improved to 4)
0555496   9 10  4  6 10   39     2 
0456687   9  9  5  9  9   41     1

(I will not submit the 5s.)

Improvements:

0556079   3 -> 1 
0455878   2 -> 1
0456288   2 -> 1
0456356   3 -> 1
0255601   5 -> 3
0556949   5 -> 4
9755293   5 -> 5