The first three grades have one job above all others, which is that a child leaves grade three reading fluently. Everything else in ten years of school stands on it.
So the timetable here looks different from the rest of the school. There is a reading period every day. Every child is heard reading aloud by an adult at least twice a week, which takes an hour of somebody's time per class and is protected in the timetable rather than fitted in. Books go home every night in a plastic wallet, and the school replaces the ones that get wet without any fuss, because a family that has to pay for a ruined book stops taking them home.
Number is taught with objects for longer than most schools do. Counters, beads, shells, anything a child can move. A child who has only ever seen a sum on a page has memorised something rather than understood it, and it stops working in about grade five.
Classes in these grades are twenty two to twenty five, the smallest in the school, which is deliberate.
What a parent can do that helps more than anything: twenty minutes of the book from the wallet, every night, out loud, with somebody listening. Not marking, not correcting much. Listening.