I agree about trying to second guess what you think the TOC expect/want you to answer, however disagree that if you fail the SJT you’re probably not right for the job. Most SJTs are intended to judge your decision making, however there’s not usually blatantly obvious answers. It’s harder when you have SJTs where you have to give numbers (1 to 4) in order of priority, as the possible answers are so close together in what one would naturally do, it’s almost impossible to prioritise in that way.
The other end of the spectrum is just having to give one answer and say what you WOULD do, and this is usually quite straightforward.