Local grad here. I spoke to a couple of overseas grad who took Part A before and after 2015. Part A at SILE is still taught by
NUS and
SMU academics so i don't think it is quality of teaching. Part A course is still not compulsory. When i was an undergrad i helped some of the profs research and draft some of the Part A materials so i can say there is not much difference in rigour and comprehensiveness of syllabus.
I am guessing that the requirements to pass have tightened. Meaning the examiners now only pass you if you say show understanding in Singapore Company Law (case law and unique features of our companies act) not general company law concepts (say directors have duties, shareholder has right to vote, separate legal personality, etc).
Just my guess. I think they should have done that long ago for the interest of the Singapore Bar really. What's the point of having Singapore qualified lawyers who can only blabber English law or Aussie law as if we are their colony.