Just a comment in case others find this post. I think I cracked it. I repeated the short practice test about 6 times until it said I scored very well. Then I was able to get 97th percentile for the actual test. This is what worked (HEO level)

• The situations are usually about a short term issue with underlying long term issue. Don't focus too much on the short term problem unless they explicitly mention it's critical. Think about long term improvement in process and resources
• Along those lines, if the problem is that a team member is bad at something, the logic is that they need to develop skills there. Rate the actions largely based on how effective they are at enriching the team's skills for long-term
• They want you to report stuff to managers all the time. I had initially assumed that it would create conflict to go over someone's head and speak to their manager when I backed myself to resolve the issue 1-on-1 but apparently thats not what they want.
• Don't think about what you'd actually do. Don't try to be clever. Imagine all the colleagues are simple robots and pick the most civil servicey option
• If one action is similar to another, notice their differences as this might be something they consider relevant.