DD has very slow processing skills and qualifies for extra time, use of a laptop and all sorts of different things. (I don't know exactly as the school works it out.)
I think it is worth working out what is helpful, and saying no to the rest. Because taking less support means that you are in a better position should it not be there at some point in the future.
DD found the (25%) extra time a godsend. She usually uses all of it. An unexpected advantage is that she leaves the exam room late so misses post-mortems. Good as she is prone to misreading questions.
She used a lap top at GCSE but does not for A level as she is taking STEM subjects, so less writing.
At GCSE she was given seperate invigilation which helped as she is easily distracted. Her sixth form does not offer this. After unexpectedly low marks in one AS, where she had been placed in the middle of the room, she will be seated in the corner at the front for A level. One thing to watch out for is that SEN kids can be distracting so it is often better that they are not sat together.
She would have hated a scribe.
A bit of understanding of what helps and does not help, both in the classroom and in exams is woth having. DDs academic performance has come on in leaps and bounds with help from her secondary schools.