That seems like a good plan. It's good that he has his own space and an adult. That would make rest breaks much more possible. It's not like he wouldn't have someone to supervise him, at least.
Not knowing your son I couldn't say whether either rest breaks or extra time would help, but it does sound like you need to politely double check that they have fully considered the guidelines in his case. I believe that some schools are so scared of being accused of malpractice that they err on the side of caution.
I've copied out the rest breaks guidance below 👇
Most pupils should be able to complete the tests without a break. However, supervised rest breaks may be appropriate for pupils who find it difficult to concentrate or experience fatigue. Rest breaks may also be beneficial to pupils using modified versions of the tests.
Schools must supervise pupils and keep them under test conditions during the rest break. There must be no contact with pupils who have taken the test and no opportunity to discuss test content.
Pupils using rest breaks should be given the same overall time as the rest of the cohort. Schools may want to split a test into sections for pupils who are known to need a rest break. If a school decides to split a test, they should:
- divide the test into sections, or plan when the pupil will have a break, during the hour before it is due to start
- keep the questions in the same order
- give the pupil an opportunity to attempt all parts of a paper, so that the outcome of the test accurately reflects their knowledge and understanding
For the English reading test, schools may want to consider stopping the test for a rest break once the pupil has completed each passage of text and answered the questions related to that text.
The test must be completed on the same day that it was started. Any partially completed tests must be sent for marking in the green panelled inner bags for modified test scripts.