I had written a similar answer a couple of weeks back so I'll just paste it here.
My guess would be that, in a trainee cohort of the size that
Linklaters have, they'd take a healthy mix of people with divergent working preferences. What I mean is, if they ask you to choose between working on familiar matters vs working on something new, one might be tempted to show that they like taking on unprecedented work but if everyone in the cohort likes challenging work, then they'd run out of people to complete the routine jobs. Therefore, I don't think you should worry if your weakness was working on familiar matters and not being a go-getter because even people who show that they like challenging work will have other weaknesses and they need all kinds of people in the cohort.
So, basically, I don't think we can figure out to hack the test. Just focus on being honest though.
Also,
https://www.thecorporatelawacademy.com/forum/threads/the-best-sjt-advice-on-the-forum.4350/ is a compilation of the best SJT/CAPP advice. Just read this before you take the test.