You are allowed to provide a reader or a prompter for children with reading difficulties, or attention difficulties etc
www.gov.uk/key-stage-2-tests-how-to-use-access-arrangements
"Readers
The use of a reader must be normal classroom practice. You must have evidence to show that resources are routinely committed to providing this support. A reader must only be used on a one-to-one basis. In most cases, this will apply to pupils whose reading age is considerably lower than their actual age.
You don’t need to request permission from us or your LA in these circumstances.
Readers are usually teachers or support assistants and they:
don’t need to be specialists in the subject being tested
should be able to read accurately and at a reasonable speed
must not be another pupil at the school or a relative / carer or guardian of the pupil
Before the test period, you need to make sure readers understand:
the test format and style
their role and what may or may not be read to a pupil in particular tests
any subject-specific issues that might occur
You should consider testing pupils in a separate room if they need more than single words or sentences read to them. For example a pupil’s individual education plan may show that they need the whole question paper read to them so that they can access the test.
If a pupil requests it, the reader may also read back any part of a pupil’s response."
We certainly had about 4 children at our school with 1:1 adult support. (not telling them the answers though!!).