Maximum possible score: 66
Scores grouped by first digit (poor man's histogram of grade-distribution, with 10-point bins; single-digit scores recorded as two-digit scores beginning with a 0):
55,50,
49,40,40,
39,39,32,31,31,31,31,
24,20,20,
19,19,18,17,16,16,15,12,
06,05
Scores grouped by letter-grade:
A's 55
---------------
B's 50
49
40
40
39
B's 39
---------------
C's 32
31
31
31
31
C's 24
---------------
D's 20
20
19
19
18
17
16
16
15
D's 12
---------------
E's 6
5