Start with the picture, not the clock. Let your child choose a picture they like and talk about it for two or three minutes before any writing: what can they see, what might be just outside the frame, who might live there and what might happen next? Saying ideas out loud first makes the blank page much less daunting, and it is the quickest way to find out which ideas they are excited by.
Plan in notes, not sentences. The plan boxes ask for words and short phrases. The point of five minutes’ planning is to decide the ending before starting, so the writing has somewhere to go. If the plan changes halfway through, that is fine: crossing out is part of planning, and a plan is there to help, not to be marked.
Practise every kind of writing, not just stories. Every picture has a second task under it in a different form, so the same Moon base can become a story one week and a diary entry or a letter the next. Writing about one picture in two forms is a good way to feel how the voice changes: a diary is private and chatty, a speech to a council is polite and pointed.
Treat the timings as practice, not a target. The times on this page are Litsee’s suggestions for practising at home. They are not taken from any school’s paper, and your child’s school may give more or less time, or a different kind of task. Start untimed. If the school your child is applying to sets a timed task, build towards its timing slowly, and only once planning feels easy.
Read it back, then celebrate one thing. Leave a few minutes at the end for your child to read the piece aloud. Hearing it is the easiest way to catch a missing word or a sentence that runs on. Then pick out one thing that works and say exactly why: “The creak of the lamp made me hear the lighthouse” tells a child what to do again far better than “good description”.
Keep it a pleasure. Your child is the author here: the pictures are a way in, and what happens next is up to them. A piece they are proud of is worth more than several written against the clock. Reading widely helps too: when a book has an opening you both love, read it aloud together and talk about how the author did it.