i haven’t noticed drastic changes in IPS material over the years so I’d just pick out those questions from older mocks as well as redo-ing more recent ones again.
I would skip through the older ones, especially to look for your weak areas (for me that would be behavioral). And read through each IPS story once and read the answer. The IPS on this exam will likely be a situation where previous issues are somehow mixed together. The more stories you’ve seen, the better you can answer the new one (my opinion).
You’ve still got the three versions of 2014 PM. I personally wouldn’t go over previous exams because you’ve already gone over them. As well, I’m trying to get enough experience as possible writing the AM session, so I would suggest you go back a few years for them.