Yeah this absolutely isn’t done in maths.
writing exam questions is a dark art. It’s horrendously easy to write a question absolutely nobody can answer because the kids just don’t have the knowledge.
eg anyone can set basic arithmetic questions like
34+25
but then you get into word problems.
we used to use old questions from GCSEs picked by topic and then we had a question about developing camera film that the year sevens didn’t understand because they’d never seen a non digital camera.
there was also a massive furore over a maths GCSEs question that asked about theatre seats - some kids hadn’t been to the theatre and had no idea how the seats were numbered or that they came in separate blocks
i used to do teacher training for maths teachers and it was always funny to pull out maths problems from another country and get them to try to solve them
eg
two cycle rickshaws are going to Gondar. How many wheels do they have?
this looks like a maths question but it is only partially. It’s also relying on you knowing what a cycle rickshaw is and how many wheels it has.
maths questions that are used at gcse go through a testing process where they are tested out in groups of people for any misunderstanding or cultural knowledge that they need.
if that cultural knowledge isn’t specifically on the syllabus as an example of that maths in context it gets binned.
for example you can no longer assume kids know about stamps. You can test them on coins and notes because it’s on the syllabus and they are expected to know there isn’t a three pound note. You can test them on volumes and sizes and measurements because they are on the syllabus but you can’t use anything with imperial units because it isn’t and a gallon (other measurements are available) is a different size in many countries.