Do maths questions crop up in the Nfer NVR tests? I mean stuff like fractions and sums with missing numbers?
Not that I have seen in NFER type NVR.
Only maths might be counting and adding edges of shapes or similar.
I did purchase a "how to do nvr" book that has fractions in, number sequences and find the missing number in three digit column addition, I think it might be aimed more at an Independent school that writes its own hybrid paper.
So I don't use it.
Best to ask somebody with experience in your region.