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...
General Subjects:
A: 413
B: 410
C: 412
D: 411
Electricity:
A: 345
B: 331
C: 348
D: 363
Steam Plants:
A: 213
B: 207
C: 203
D: 188
Motor Plants:
A: 239
B: 239
C: 209
D: 257
Engineering Safety:
A: 221
B: 226
C: 222
D: 277
Refrigeration AC:
A: 149
B: 159
C: 163
D: 139
Gas Turbine Plants:
A: 51
B: 62
C: 43
D: 76
General Subjects:
A: 413
B: 410
C: 412
D: 411
Electricity:
A: 345
B: 331
C: 348
D: 363
Steam Plants:
A: 213
B: 207
C: 203
D: 188
Motor Plants:
A: 239
B: 239
C: 209
D: 257
Engineering Safety:
A: 221
B: 226
C: 222
D: 277
Refrigeration AC:
A: 149
B: 159
C: 163
D: 139
Gas Turbine Plants:
A: 51
B: 62
C: 43
D: 76