I'm looking at the Grade 5 cello sight-reading parameters. They include: "time and key signatures as Grade 4,with the addition of E minor. Highest note A (a'): shifts as required to cover this range." No mention of actual positions.
Scrolling back to the Grade 4 ones I read in typical pompous AB prose: "Shifts between 1st and 4th positions may be encountered". No mention of the highest note.
I find I'm not absolutely sure what are the lowest and highest notes that count as 4th position on a cello A string to take as a point of reference.
I describe myself as a teaching accompanist, and as well as rehearsing the accompanied pieces for an exam I always include sight-reading practice. I positively enjoy helping people to boost their sight-reading marks, and write my own examples (sometimes in consultation with players or teachers of the instruments in question), each of which includes as many of the parameters as possible. My aim is to have any candidate I accompany come out of the exam and say "the sight-reading was easier than what you gave me".
Writing my own examples also has the advantage that there's absolutely no chance that the candidate will have seen them before.
It turns out I haven't accompanied a Grade 5 cello exam since the last syllabus change, so I've just been checking the parameters. I find it seriously irritating that I have to trawl through the Grades 1-4 ones in order to compile the Grade 5 set, especially as there's plenty of white space to include the full details for each grade on the syllabus pages. People can download the syllabus for a single exam but then find they haven't got all the relevant information.
End of rant...