Writing Craft

How Long Should a NSW Selective Writing Response Be?

Written by Hao, a Sydney data analyst and parent of a 2025 NSW Selective student. Last updated 23 July 2026.

There is no official word limit for NSW selective writing. Students type as much as they can do well in the 30 minutes. Across more than 200 real practice essays we scored, the strongest scores clustered at about 350 to 450 words. Under 250 words scored noticeably lower, and padding past 450 did not help. The real target is to develop one idea fully, and a well-developed piece naturally lands in that range.

"How many words should my child write?" is one of the questions I hear most, and it usually comes from a good instinct: parents want a concrete target. There is no official answer, but because I built a tool that scores practice essays, I can give a data-backed one instead of a guess. As always, treat it as a practical benchmark, not an official rule.

Is There an Official Word Limit?

The NSW Department of Education sets the writing task as one response to a stimulus in roughly 30 minutes. It does not state a minimum or maximum number of words, and there is no box that fills up or cuts you off. The format and process are on the official placement test page. So the honest answer to "how many words" is "as many as your child can write well in the time," which is not very satisfying. The useful part is what "written well" tends to look like in practice.

What Our Practice Data Shows

I looked at the practice essays scored on EurekaWrite (more than 200 real pieces from local students preparing for the test) and grouped them by length. The pattern was clear:

Length	Average practice score (out of 25)
Under 150 words	16.9
150 to 250 words	18.6
250 to 350 words	20.4
350 to 450 words	21.3 (highest)
450 words and over	20.8

Two honest caveats before you read too much into it. First, this is our practice score, not an official mark. Second, and more important, this is a correlation, not a cause: stronger writers naturally write more, so the length is partly a symptom of skill rather than the thing that creates the score. You cannot lift a weak piece by padding it to 400 words. But the practical takeaways below hold up either way.

Why Writing Too Short Costs Marks

The clearest signal in the data is at the short end: pieces under 250 words scored noticeably lower, and under 150 lower again. This is rarely about the word count itself. It is about what a short piece usually is: an idea stated but not developed, a story that stops before its ending, a paragraph with a claim and no example. Markers reward development, a clear structure, and a satisfying finish, and a very short response simply does not have room for those. For most children preparing, the biggest single risk is not writing too much, it is not writing enough to finish and develop the piece.

Why Padding Past 450 Words Does Not Help

At the other end, the data is a useful corrective to the idea that longer is always better. Past about 450 words the average score did not climb, and it dipped a little. Long is not the same as good. When a child keeps writing past the point where the idea is finished, the extra sentences tend to repeat, wander, or pad, which markers notice: it weakens sentence variety and control (Set B) and dilutes the style and structure (Set A). A tight, well-shaped 380-word piece beats a rambling 520-word one almost every time.

The Real Target: Develop, Don't Count

The reason 350 to 450 keeps coming up is not magic about those numbers. It is roughly how long it takes to do the things that score well: an opening that sets up one clear idea, two or three paragraphs that each develop it with specific, picturable detail, and an ending that lands. If your child focuses on doing those things, the length looks after itself. So the target to give a child is not "write 400 words," it is "explore one idea properly and finish it." If they routinely come in under 250, the fix is usually more development (a specific example in each paragraph), not more sentences. If they routinely run past 500, the fix is usually cutting repetition and tightening.

Length and the 30-Minute Clock

Length is really a time problem in disguise. A rough split that works: about 5 minutes to plan, 22 to write, and 3 to check. At a comfortable pace that produces a developed piece in the 350 to 450 range with a little time to proofread. Because the test has been typed on a computer since 2025, typing speed feeds directly into this: a slow, hunt-and-peck typist can run out of time before finishing or before checking, which pushes them into the short, lower-scoring band for reasons that have nothing to do with their ideas. If your child's practice pieces are consistently short and unfinished, check whether typing speed is the real bottleneck before assuming it is a writing problem.

A Simple Way to Practise This

Set a 30-minute timer and a real prompt, and have your child write to the clock. Afterwards, look at two things before anything else: did they finish (a real ending, not a sentence that just stops), and roughly how long is it. If it is short and unfinished, the next session is about developing and finishing, not about writing faster for its own sake. If it is long and repetitive, the next session is about cutting. Our writing practice workspace gives timed prompts to type into, and how to improve at home has the week-by-week version of this loop.

The Bottom Line

There is no official word count, and chasing a number is the wrong goal. But if you want a practical benchmark from real data: aim for a developed, finished piece, which usually means about 350 to 450 words in the 30 minutes. Worry about writing too little far more than too much, because an underdeveloped or unfinished piece is where most marks are actually lost. Develop one idea properly and the length takes care of itself.

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