Every September a sheet appears: the timetable. A little later, a second one with the bell times, because schools print those separately. Copying both into a phone by hand is an evening of repeating alarms, and one mistyped hour sends a child somewhere at the wrong moment. Photograph them instead — and if the paper does not say when a lesson ends, neither will the reminder.
The subject grid says which lesson sits in which slot on which day. The bell sheet says when slot 2 starts and finishes, and it is the same every day. They are two documents because a school prints them as two documents, so the app reads them as two documents.
Either can come first. Send the bells and then the subjects, or the other way round; they are merged by slot, so a sheet that only shows lessons 1 to 4 never erases what is already known about 5 and 6.
"Geometry after physics" has no moment in it. There is nothing for a notification to fire at, and an app that pretends otherwise has to invent an hour to fire at.
So it says so, and offers to keep the week as notes — one note per day, not one per lesson, because "Monday: geometry, physics, history" is one thing a person knows. Photograph the bell sheet later and the same grid turns into reminders, with nothing re-photographed.
If a row is unreadable it is reported, not reconstructed. If the paper gives a start and no end, the reminder has a start and no end. Forty-five minutes is a reasonable guess about a lesson and a terrible guess about a child waiting at a gate.
Nobody needs telling that maths is over. What the afternoon turns on is when lessons finish — meeting them, bread on the way home, the book that goes back to the teacher — so ask for that: after school, remind me to…
Days that finish at the same time share one reminder rather than becoming five near-identical ones, and a day whose last lesson has no end time is named and left out instead of quietly guessed.
A timetable is not right the first time. Say on Tuesday the second one is chemistry, not physics and that slot changes; the rest of Tuesday stays as it was. A plain list replaces the day, a numbered lesson edits one slot — the difference lives in the words, so you never learn a syntax.
Keep more than one and name them, and each message says which it belongs to.
A timetable counts as one against your limit, not thirty-four. What you manage is "my son's school timetable", added once. The free plan keeps one timetable; notes carry no trigger and cost nothing at all.
Parents can set reminders for each other and for the child. A family here shares reminders and never location.