From the posted coordinates you will need to read the signs and extract some information (nothing to difficult)
Stage 1
Using the engraving
S44 24.ABC E171 14.DEF
A= *0 ex pupils A= * minus 6
B= *0 ex pupils B= * minus 7
C= *0 ex pupils C= * minus 1
D= About *60 others D= * plus 5
E= About *60 others E= * plus 4
F = About *60 others. F= * minus 3
Stage 2
S44 24.ABC E171 14.DEF
A= 2* December A= * minus 3
B= 2* December B= *
C= 2* December C= * plus 1
D= 2* December D= * plus 5
E= 2* December E= * plus 6
F = 2* December F= * plus 1
Stage 3
S44 24.ABC E171 14.DEF
A= 191* A= * minus 1
B= 190* B= * minus 1
C= 191* C= * minus 2
D= 191* D= * plus 6
E= 190* E= * plus 7
F = 190* F= * plus 4
Stage 4
S44 24.ABC E171 15.DEF
A= 199* A= * minus 3
B= 199* B= * minus 1
C= 199* C= * minus 3
D= * April D= * plus 1
E= * April E= * plus 2
F = * April F= * plus 6
Final
S44 24.ABC E171 15.DEF
A= December 198* A= * minus 2
B= December 198* B= * minus 3
C= December 198* C= * plus 4
D= 18*3 D= * minus 8
E= 18*3 E= * minus 2
F= 18*3 F= * minus 7