Turning a past paper into a reviewer you can revise from

Import is a transcription job, not a writing job

Hachi has two generator modes and they are opposites. Study Material writes questions your notes do not contain. Exam Paper copies a paper that already exists, question for question, in order.

Import therefore adds nothing. If a question is not on the paper you uploaded, it will not appear. That is deliberate, and it is why an imported reviewer is a faithful revision copy rather than extra practice.

Pick Exam Paper whenever you already have the paper, and Study Material whenever you have notes and want questions built from them.

Two ways to handle the answers, and they are not interchangeable

The import asks you how it should treat the answer key, and the choice changes the meaning of every question in the reviewer.

• Solve the answers: Hachi works out the answers itself, and credits an answer it can read off the paper. Use this when your copy has no key, and you want to attempt the paper.
• Extract only what is shown: Hachi uses only what appears in the upload and treats anything else as unanswered. Use this when you have checked a key yourself, or when the paper came with a mark scheme you trust.

Under extract, Hachi will not answer an item it cannot see an answer to, even if it could reason it out. That is the correct behaviour: the point of the mode is to transcribe, not to solve. An item it genuinely cannot resolve is dropped from the reviewer and reported back as a count, rather than guessed at.

Getting the paper in cleanly

Paper runs long, and a three-page paper is three photos rather than one. Drop them all onto the upload area together and Hachi pools them into a single request. Keep the pages in order and in good light; the most common import failures are a shadow across the question and a crop that cuts off the options.

A photo or a PDF always routes to a vision-capable provider even if you also paste some typed notes, so a mixed upload is fine. Photographs are downscaled before they are sent if they are larger than about 2000 pixels on the long edge, which is enough resolution to read a printed question and small enough to upload quickly.

Check the first few before you revise from it

An imported reviewer is a transcription, and transcriptions have failure modes: a question split across two pages can merge badly, a table can come out garbled, and an option list can pick up a stray line. Open the reviewer and read the first five questions against the paper before you sit a full practice run on it.

Edit anything wrong before revising. The question editor lets you change the question, the options, the correct answer and the explanation in place, and the edit is saved to the reviewer itself rather than to the session, so the correction holds for every future attempt.

What to do with it afterwards

Treat an imported paper as your measure. A generated reviewer is practice; a real paper is the closest thing to the exam you will get, and the score on one is worth more than several high scores on generated material.

Run it once without notes, look at which questions you got wrong rather than at the total, and then use Review Answers to work through those. If you want to retake it later to see whether the gaps closed, that is exactly what the spaced revision guide is for.