What is a person called who writes for a blind person in an examination hall?

Blind people may need help in examination halls for writing.

I want to know the single word which may be used for the person who helps them with that.

Solution 1:

The term most often used for this kind of academic accommodation is scribe.

A scribe is someone who writes down a student's answers to test questions. If it is a writing test, the scribe might write a person's essay as the test taker dictates it through speech, sign language, or by using some type of assistive communication device. . . . A scribe may also be used on multiple choice tests to fill in the "bubbles" on an answer sheet or to write short answers.

(From "Response Assessment Accommodations" at Special Connections, the University of Kansas's site "for general and special education teachers, related service personnel, para educators, parents and other professionals engaged in the meaningful inclusion of students with special needs in the general education curriculum")

It is also used in the UK:

A scribe is a writing assistant who writes out answers dictated by the pupil.

(From GOV.UK's "Key stage 2 tests: how to use access arrangements"; see also this example, with thanks to SusanW)

and Australia:

A scribe may be used for the NAPLAN writing test to assist a student with disability, provided that the student meets the criteria set out in the National protocols for test administration (the protocols). . . . Scribe rules explain requirements such as writing as the student dictates, and not suggesting or prompting the student for ideas or words.

(From "Adjustments for students with disability" in the National Assessment Program's "school support" section. Thanks to Scott for pointing me toward this example.)

Note that this accommodation is not limited to (or possibly even most often employed by) individuals with visual impairment:

The scribe accommodation is appropriate for students with a physical disability that severely limits or prevents the student’s motor process of writing, typing, or recording responses during testing.

(From the PARCC consortium's "Protocol for the use of the scribe accommodation and for transcribing student responses", Accessibility Features and Accommodations Manual Appendix C.)

The term scribe can also be used as a verb to describe the actions of the person taking dictation.

Examples: [sic] When Angela took the State Educational Assessment, Ms. Anderson, the teacher's aide, scribed her responses to the written Math section.

(Jerry Webster, "Scribing -- an Accommodation for Children with Writing Problems", ThoughtCo., October 25, 2015)

Solution 2:

Amanuensis

A person employed to write or type what another dictates or to copy what has been written by another, and also refers to a person who signs a document on behalf of another under the latter's authority

The entry goes on to describe, the very usage you have described:

It is also used in a specific sense in some academic contexts, for instance when an injured or disabled person is helped by an amanuensis at a written examination.

-- Wikipedia

Here are a couple of additional examples of the word being used in context of the question:

Amanuensis/scribe will be provided to the Blind & Physically Handicapped ...

-- Education and recruitment board

Candidates who require an amanuensis must contact the Theory office ... it is assumed that blind candidates will attempt the exam in this way.

-- Associated Board Of The Royal Schools Of Music - special needs for the partially sighted

Solution 3:

That's funny. One word seems totally obvious to me, an ordinary prosy word without the exotic flavor of Scribe, Amanuensis and Aide.

Transcriptionist: one that transcribes; especially: a typist who transcribes dictated medical reports

On the other hand the software I'm using to type these words has indicated that my answer is not a word, and suggests Transcriptional, Transcription and Transcript instead. I guess that's another sign of how arbitrary these judgments are.

Solution 4:

This makes me think of the word proxy, which Merriam Webster defines as:

Definition of proxy

1 : the agency, function, or office of a deputy who acts as a substitute for another

2 a : authority or power to act for another

2 b : a document giving such authority; specifically : a power of attorney authorizing a specified person to vote corporate stock

3 : a person authorized to act for another : procurator

Specifically, definition 3.

As an example:

At the examination, there were no facilities for my vision impairment, so I brought along my cousin who acted as my proxy.

Solution 5:

aide From the Oxford English Dictionary:

3. Chiefly U.S. A person employed as an assistant or ancillary worker, esp. at a hospital, or in the home of an elderly or disabled person.

The work of an aide is not necessarily confined to a medical facility or the home. A quadriplegic, for example, needs an aide not only at home, but when he goes out to work or to a social function. A person with severe Down's Syndrome needs a family member or a friend or an aide when venturing outside the house. I know two such people, and their families refer to these professional helpers as aides. If a blind person needed assistance at an exam, in the US, she would likely make the case that she needed an aide at the exam.

Aide is widely understood in the US as a professional, trained person who performs whatever tasks are needed for the disabled person to live some approximation of a normal home, work and social life outside a medical facility. The aide has less medical training than a nurse or therapist.

I agree that nowadays, technology should be able to do the work of an aide in the particular case the OP mentions.