The September problem
Every immersion teacher knows the September problem: words taught carefully in the spring come back from summer break gone. It is not a failure of the teaching. The classroom is excellent at introducing language — context, repetition within the unit, a live speaker modeling tone. But retention is a scheduling problem, and a classroom moving thirty students through a curriculum cannot re-surface each word for each child at the moment that child is about to forget it.
That is the precise shape of the home-practice opportunity. Not more teaching — the school has teaching covered. Review, timed per child, in short sessions that survive weekends, holidays, and summer. The mechanism is spaced repetition (间隔重复), and we explain it fully in our guide to how spaced repetition works for children.
Match the home tool to the school curriculum
The biggest mistake families make is buying a second curriculum. A random word app pulls the child toward a different vocabulary sequence, and home practice starts competing with school instead of compounding it. The fix is to align on the standard most Mandarin programs already use: the HSK, China's official proficiency framework. If the term is new to you, start with our parent's guide to the HSK.
Immersion students typically test at HSK 2 or 3 by the end of grade 2 — you can sanity-check that against the actual word lists for HSK 2 and HSK 3, which are free to browse. Words your child recognizes but stumbles on are exactly the right level for home review.
Aligned this way, home practice has a clean job description: re-surface the vocabulary (词汇) the classroom introduced, at the right interval, until it is permanent. The school sets the sequence; the home protects the investment.
Input at school, output and retrieval at home
Immersion is built on comprehensible input — the idea, associated with Stephen Krashen's research, that learners acquire language by understanding messages slightly above their level. Six hours a day of that input is the immersion school's superpower, and nothing at home replaces it.
What home practice adds is the other half: retrieval and output. Pulling a word from memory unaided strengthens it far more than hearing it again, and saying it aloud — tone (声调) and all — is what turns passive recognition into usable speech. Fifteen minutes of retrieval practice at the kitchen table complements the classroom rather than duplicating it. That output-first stance is core to our method, documented on How we teach.
The practical recipe for families: short daily review of HSK-aligned words, spoken aloud, capped so it never crowds out reading or play. Consistency over volume. The streak matters more than the session length.
What schools themselves can do
Some immersion schools close the loop directly. Bóyǎ School is built for that: the school imports a class roster, students practice the words their classroom introduced, and the teacher sees which words each student actually retains — per student, per word, measured by retention rather than minutes logged. Duels stay scoped to the classroom and gated by the teacher.
The safety posture is the same one families get: student profiles are created under the school, with no public profiles, no friend search, no direct messages, and no notifications to student accounts — the full policy is published on Safety & privacy. Homework that maintains itself, and a September where the spring vocabulary is still there.