Assignment and exam scores

A1 A2 Final Exam
ID     1a 1b 1c 1d 1e 1f 1g 1h 1i 1j 2a 2b 3a 3b
max 100 max 100 5 5 5 5 5 5 5 5 5 5 15 15 10 10
74 90 90 5 5 5 5 5 0 0 0 0 3 5 0 6 7
143 88 93 5 5 5 5 5 5 5 5 5 0 11 13 8 6
346 90                              
379 100 96 1 5 4 3 4 5 4 4 3 3 12 8 9 8
405 98 96 5 5 5 5 5 0 0 0 0 0 13 13 10 8
423 94 90 5 4 4 4 3 2 2 1 4 2 6 5 7 6
641 92 95 5 5 5 5 5 5 5 5 5 0 10 8 9 8
649 93 96 5 4 5 3 3 0 2 2 0 0 12 13 8 7
676 92 90 5 5 5 5 5 0 4 4 3 0 13 14 10 8
731 97 96 5 4 4 5 5 2 0 0 0 2 14 13 7 7
846 88 86 5 5 4 4 3 4 3 4 4 0 13 8 7 7
915 100 98 5 5 5 2 5 5 5 5 5 5 13 11 9 7
1060 90 96 5 5 5 5 5 5 5 5 5 4 12 15 10 8
Your ID is the following function of your G-number:
n4n5+n6n7n8, where ni is the i digit of your G-number
E.g., G01234567 results in 34+567=0601