I don’t think anyone can complain even if part A failure rates are at 50% or higher.

Look at stats. NY Bar Exams has a pass rate of 30%+ for overseas law graduates.
UK QLTS has a 50% pass rate for the MCT which is typically the control mechanism before you can sit for the second half oral vivas in London.

Part A has always been a control of academic standards in Singapore. It deserves to be that way. Yet to set things in context, a NUS grad would have covered the 5 modules (plus other subjects) over 4 years. The overseas grad has to do it in 5 months.

Having said that, if you study hard, there is no reason to fail.
Part A is open book. When I was an undergrad in UK not too long ago, all our law exams were closed book. If you can even pass a closed book exam, I do not understand how you can fail an open book one.