I think your friend has been playing too much gambling. What makes him think that the 2022 maths advanced exam will be easier? Instead of reckoning that the 2022 one will be slightly easier, he should work as hard as possible on mathematics (not so much that he suffers from burnout). You know so you do not go onto the headlines of Sydney Morning Herald, The Daily Telegraph, etc as the students who found the exam challenging. A sign of personal shame.