This is a short article because the list is short. It matters anyway, because the failure mode is total: candidates who arrive without the right identification are turned away, lose the fee, and have no appeal at the counter.
Bring
The identification named on your booking confirmation. This is the whole article. Prometric centres check that the name and document match your registration exactly, and “exactly” means exactly — same spelling, same order, same document type.
For most candidates this is a passport. Confirm what your own country’s Prometric page lists as acceptable, because the accepted documents differ by country, and confirm it when you book rather than the night before.
Your confirmation. Saved offline — downloaded, screenshotted, and emailed to yourself. Do not plan on logging in to Prometric from a phone on a poor connection outside the centre.
The centre address and your route. Including how long it takes at the time of day your test starts, not at the time of day you looked it up.
Do not bring, or expect to leave outside
Prometric centres are strict testing environments. You should expect to store personal belongings outside the testing room, and expect that phones, watches, notes, dictionaries, bags and food will not come in with you.
Specifics vary by centre, so read the rules on your confirmation. But plan on carrying as little as possible — there is no advantage to arriving with things you cannot take in.
You do not need to bring pens or paper. The test is computer-based, and where scratch material is permitted the centre provides it.
The name problem, which is the real one
The single most common reason people are refused entry is a mismatch between the name on the booking and the name on the identification.
This is a bigger risk for this audience than for most. If your passport shows a single name with no surname, if your name is transliterated differently across documents, or if the family name comes first on some papers and last on others, then whichever version appears on your passport is the version that must appear on your Prometric booking.
Fix it when you register, not later. Changing a name after payment is slow, and discovering the problem at the counter is fatal to that attempt.
Timing
Arrive at the reporting time on your confirmation, which is earlier than the test time. Check-in involves identification, storage and seating, and it is not instant.
If you are travelling more than about three hours, go the night before. A cancelled bus should not be able to cost you the fee, and for anyone travelling any distance an overnight stay is cheaper than a retake.
Everything else about the day
What happens from check-in to your provisional score is covered in JFT-Basic test day, and the booking process itself in how to register on Prometric.
One last thing that is not on any list: stop studying the day before. Sleep does more for a sixty-minute test than a late cramming session, and you are not going to learn the word that decides it between ten and midnight.