I have heard a few cases where A+ for all 3 GA's still resulted a 37-39!!
Ultimately A+ doesn't mean all that much after all?
VCAA sets ranges for A+ to ensure that only the top 9% of people are in this range. so i am a bit suspicious about the definition of the A+ you are referring to.
This year's physics GA2, for example, has a high A+ cut-off for the exam, where only those who have lost less than 4 marks are granted an A+. Imagine, if you have lost 5 marks in this exam, you will be merely getting an A for this exam, whereas using our common/general definition of an A+ ( 90-100%), you will be in the A+ range.
Maybe those who claimed that they got A+'s found their grades without considering the cut-offs....?