It was in line with the spec, they will have practised each skill before. The issue is that the scenario they are given is not known. The kids that actually learn how to apply the skill, don't just copy past exam/practice question answers, read the scenario, look at the question, recognise the skill being asked for and apply it to the new scenario.
The kids that have done the understanding part but missed the application bit of their lessons, look at the scenario, start to worry that they have missed something, they have never heard of toad fishing in the Ukraine, they don't know how to fish for toads. They barely read the question, in their growing panic don't recognise the skill being asked for and, even when they do, can't apply it as they have not been taught about toad fishing in the Ukraine.
It happens every year, in A levels too. As an ex A level teacher this was what I spent most of my time on... patiently explaining that knowing what was not enough. How To was more important.