Here are the national shelf exam scores reported as Mean and Standard Deviation and is separated by quarters such that people taking shelf exams early in the year are compared with others taking it early in the year.
MEDICINE
Total Year: 74.0 8.3
Quarter 1: 72.6 8.1
Quarter 2: 73.4 7.9
Quarter 3: 74.7 8.2
Quarter 4: 75.0 8.7
NEUROLOGY
Total Year: 71.2 7.7
Quarter 1: 70.5 7.7
Quarter 2: 71.2 7.6
Quarter 3: 72.2 7.7
Quarter 4: 71.3 7.8
OB/GYN
Total Year: 70.8 8.3
Quarter 1: 69.5 8.2
Quarter 2: 70.2 8.5
Quarter 3: 71.8 8.1
Quarter 4: 72.0 8.4
PEDIATRICS
Total Year: 73.6 8.3
Quarter 1: 72.0 8.1
Quarter 2: 73.3 8.0
Quarter 3: 74.3 8.4
Quarter 4: 75.2 8.4
PSYCHIATRY
Total Year: 76.2 8.5
Quarter 1: 75.3 8.6
Quarter 2: 76.4 8.5
Quarter 3: 76.5 8.3
Quarter 4: 76.7 8.3
SURGERY
Total Year: 70.3 8.8
Quarter 1: 67.5 8.4
Quarter 2: 69.8 8.5
Quarter 3: 72.2 8.5
Quarter 4: 73.1 8.7
You can ask your school administration for a copy of the NBME analysis for each exam which will give you the above data plus the specific percentile for each possible score and suggested minimum scores for passing and honors per course director survery.