revise/revision (British)

Revision is still the word used:-

1. the act or process of revising
2. (Social Science / Education) Brit the process of rereading a subject or notes on it, esp in preparation for an examination
3. (Communication Arts / Printing, Lithography & Bookbinding) a corrected or new version of a book, article, etc.

where revise is defined to be:-

1. to amend or alter: to revise one's opinion.
2. to alter something already written or printed, in order to make corrections, improve, or update: to revise a manuscript.
3. British . to review (previously studied materials) in preparation for an examination.

The meaning of study for an examination is only one of the possible meanings.

Edit: Revised is also used in British English in the sense of study for exam (I revised my physics course yesterday).

Revisionist is slightly different:-

noun

1. an advocate of revision, especially of some political or religious doctrine.

2. a reviser.

3. any advocate of doctrines, theories, or practices that depart from established authority or doctrine

adjective

1. of or pertaining to revisionists or revisionism.
2. attempting to re-evaluate and restate the past based on newly acquired standards.

While it has the general meaning of reviser, I have never heard it used in the second noun sense, only the first and third. One could, I suppose, call someone studying for an exam a revisionist, particularly if they were studying very hard, but it would sound odd or jocular.

The simple answer, from all the above, is that we British use "revisionist" and "revised" precisely the same way as an American English speaker in the phrases “revisionist history” and “revised the terms of the agreement”. I do think in the final case ("revised his answer") we are more likely to say "rehearsed" or "reviewed" depending on what is meant, but would say "revised thoroughly for a physics test".

In the U.S. when we prepare for exams we study or are studying for them. Examples: 1. I need to study for my final exam. 2. Have you finished studying for your final exam?

As for "revised his answer," I have never heard anyone refer to it as "rehearsed" although possibly "reviewed" would apply. For example, you revise (change) your answer after you have reviewed (looked it over) it.