The problem during revision, specifically, is that the stakes and the boredom rise together. Past-paper practice and flashcard drilling are repetitive by design — that's what makes them effective — and repetitive work is exactly the kind your phone is best at rescuing you from, at precisely the moment the calendar has the least room left to lose. "I'll do ten more minutes of TikTok and then get back to it" is a sentence revision students say to themselves constantly, and the exam date doesn't move to accommodate it. Unlike ordinary term-time studying, where a lost afternoon can usually be made up later in the week, revision time is a fixed, shrinking pool — every hour spent scrolling instead of drilling past papers is an hour that simply doesn't exist anymore once the exam date arrives, which raises the real cost of the exact same five-minute phone check considerably. A single missed evening three weeks out barely registers against a full term; the same missed evening the week before finals can mean an entire topic never gets a second pass before the exam, which is exactly why revision periods deserve a tool that holds up under pressure rather than one that only works when things are already going well.
What you've probably already tried
Revision timetables, the Pomodoro technique, revision-specific playlists, going to the library specifically to remove the phone from easy reach, and probably a free blocking app installed with real intent during the first week of study leave and quietly disabled by the second. The pattern is consistent: intent is highest furthest from the exam, and the willingness to maintain a self-imposed block erodes exactly as the actual deadline gets closer and the stakes get higher — the opposite of what you'd want. Study groups and past-paper "drilling parties" with classmates help for the sessions where everyone actually shows up, but revision is mostly a solitary grind punctuated by short, repetitive tasks, and it's precisely those repetitive stretches — the fortieth flashcard, the third past paper on the same topic — where the pull toward the phone is strongest and least likely to be caught by anyone else. None of this is a character flaw — it's a completely predictable pattern once you notice that the thing being asked of you gets harder precisely as the thing available to escape it stays exactly as easy as it always was.
Why generic blocking advice fails specifically here
"Just use your revision timetable and stick to it" assumes the sticking is the easy part, but during a compressed revision period, decision fatigue compounds fast — you're already making hundreds of small choices about what to revise and how, and asking yourself to also actively police a phone block on top of that is one more depleting decision, repeated every single time temptation shows up, which during exam season is often. It also underestimates how much revision specifically wears down resolve through sheer repetition: doing the twentieth near-identical practice question of the day takes the same discipline as the first, but by then the felt cost of one small break has dropped while the temptation to take it has, if anything, gone up. Decision fatigue research on willpower more broadly backs this up: the same self-control resource gets drawn down across a day of small choices, and revision periods are unusually dense with exactly that kind of choice, over and over, for weeks at a stretch.
The honest fit
A quiz-gated block genuinely suits the revision use case well: the cost of checking your phone becomes a small, real interruption — get the questions right, back to revising — rather than a negotiation you have to win against yourself every time. Because the friction doesn't require you to actively decide anything in the moment, it holds up even as your remaining willpower drops closer to the exam date, which is exactly when a self-policed block tends to fail. There's also a practical benefit specific to revision: because the block doesn't need to be scheduled around a fixed timetable the way a calendar-based Focus mode does, it holds up just as well during the odd, fragmented revision hours — a free period between classes, a late-night session before a morning exam — that don't fit neatly into a pre-planned block.
Where it isn't the right fit
For the final, highest-stakes cramming stretch — the night before, or a single make-or-break revision day — some students genuinely do better with a harder, no-negotiation lock like Cold Turkey's Frozen Turkey mode or Freedom's Locked Mode, where the option to get back in simply doesn't exist for a set window, rather than a friction that's always technically surmountable. And if revision anxiety itself, not distraction, is the real driver of procrastination, that's a conversation for a teacher or counsellor, not a blocking app. It's also worth saying plainly that no amount of blocking fixes revision started too late — if there are three days of material left and one day on the calendar, the honest answer is triage and realistic expectations, not a stricter app, and pretending otherwise would be exactly the kind of overselling this page is trying to avoid. Realistic triage, a shorter list of higher-value topics, and getting sleep instead of grinding through the last few hours matter more at that point than any blocking tool, however well it's set up.