There’s no single “correct” age to begin, but there is a pattern that works for most families: start earlier and lighter rather than late and heavy. The Selective test rewards skills that build slowly — reading, reasoning, writing — so a gentle, long runway usually beats a frantic sprint.
Year 4 — foundations
At this stage, forget the test. The best preparation is broad and invisible: a daily reading habit across different kinds of books, strong number sense, and plenty of curiosity. Children who read widely and enjoy puzzles are quietly building the exact muscles the test draws on later.
Year 5 — the step-up
This is a natural time to introduce gentle, test-style practice — short sessions, the occasional timed exercise, and a first look at the on-screen format so it isn’t strange later. Keep it light and positive. Year 5 also happens to be when applications open, so it’s a sensible planning year.
Year 6 — the focused cycle, then taper
The test is sat in Year 6, so this is the year of structured, realistic practice: full-length selective practice tests, reviewing every mistake, and sharpening pacing and writing under time pressure. A guided course such as Selective Mastery can give this stretch shape and feedback.
Crucially, end with a taper, not a cram. In the final stretch, ease off rather than pile on. Confidence and rest do more for performance than one last marathon of worksheets.
Protecting against burnout
Whatever the timeline, watch for the warning signs — dread, tears, falling enjoyment. Keep sessions short and regular, guard downtime and play, and remember that consistent, good-quality practice beats sheer volume — what helps is realistic practice and specific feedback, not more hours for their own sake. The aim is a child who walks in calm and capable, not crushed. See our broader notes on selective test preparation for how to keep the balance right.