I've searched the database and have come up with the following stats on which questions have the most selected answers A, B, C, or D. This may or may not be helpful on specific tests, but they all look pretty even...
Rules of the Road:
A: 233
B: 269
C: 249
D: 303
Deck General:
A: 1,041
B: 1,210
C: 1,234
D: 1,181
Nav General:
A: 502
B: 507
C: 501
D: 538
Deck Safety:
A: 642
B: 671
C: 699
D: 691
Nav Problems:
A: 289
B: 248
C: 244
D: 290
Rules of the Road:
A: 233
B: 269
C: 249
D: 303
Deck General:
A: 1,041
B: 1,210
C: 1,234
D: 1,181
Nav General:
A: 502
B: 507
C: 501
D: 538
Deck Safety:
A: 642
B: 671
C: 699
D: 691
Nav Problems:
A: 289
B: 248
C: 244
D: 290