I am well aware of language difficulties students might face and I am also aware that qualifications have competences that must be met.
So within some maths qualifications there might be several different areas that are tested, and a student might excel at pure maths that does not require contextualization. If they have barriers with language they will not experience so many difficulties here.
However the maths qualification might also cover areas of applied maths, for example questions on probability and statistics that require extensive text description of scenarios, and of course that is likely to be harder for students that experiences barriers with language to do well in these.
However, if it is a competence that is being assessed in the qualification the student cannot opt out of these questions. Well they can, but they will lose marks. Maths qualifications may have a remit of preparing for real world scenarios, and they often do situate problems in social contexts.
If there are massive language difficulties teacher or parents might make the decision that a different type of maths qualification is appropriate for them, one where they can more readily demonstrate their competence in their areas of strengths.
However for most students this is an area that can be addressed with appropriate preparation and reasonable adjustments in the timed examinations themselves.
If a teacher or apparent anticipates that a student might face difficulties with pronouns for whatever reason the right way forward is to spend more time preparing for questions so that they are in a strong position to tackle them on the day.
It is not the right way forward to change the exam paper altogether just in the same way it would not be the right way forward to change the character names used because there will be some students that might struggle with names that they are not familiar with. Adequate preparation should address any potential issues.