Always consider part b to be the true national exam for law (like PSLE).
Bcos:
(1) law schools are not national exams (NUS, SMU and the foreign unis have their own marking scheme and standards)
(2) part A is just overseas uni competing among themselves without NUS and SMU grads (which are technically more superior than overseas grads esp Aust unis)
(3) part B brings both local and overseas grad together taking a standardized exam administered by the SILE. So to do well in Part B means you are truly the best