NSW Test Guide
OC vs Selective in NSW: What's the Difference?
The Opportunity Class (OC) test and the Selective High School test are two different exams. OC is sat in Year 4 for Year 5 entry and has three papers, Reading, Mathematical Reasoning and Thinking Skills, with no writing. The Selective test is sat in Year 6 for Year 7 entry and has four papers, each worth 25%, adding Writing. Three of the four Selective papers build on the same skills as OC. The one that does not carry over, writing, is also the slowest to build, which is why families who prepare only for OC often meet it cold two years later.
If your child is preparing for the Opportunity Class test, it is worth knowing early how it relates to the Selective High School test that many OC students sit two years later. The two overlap more than most comparison pages admit, in exactly three of four subjects, and differ in one that matters more than its share of the marks suggests. This guide keeps the exam mechanics brief and links them to the official NSW Department of Education pages; the depth here is on the one subject, writing, that OC preparation does not cover.
The Quick Comparison
| Opportunity Class (OC) | Selective High School | |
|---|---|---|
| Sat in | Year 4 | Year 6 |
| Entry to | Year 5 (opportunity class) | Year 7 (selective high school) |
| Test sections | Reading, Mathematical Reasoning, Thinking Skills | Reading, Mathematical Reasoning, Thinking Skills, Writing |
| Writing? | No | Yes, one of four sections |
| Weighting | Three sections (about a third each) | Four sections, each 25% |
For exact question counts, timings and current-year details, use NSW Education as the source of truth (the specifics can change year to year): the Opportunity Class placement test page and the Selective placement test page. What stays consistent, and all that matters here, is the shape: OC has three test sections and no writing; Selective has four, and the fourth is writing.
Are the Two Tests Connected?
This trips a lot of parents up, so it is worth stating plainly. The OC and Selective tests are separate applications with separate results. Sitting or winning an OC place gives no bonus and no head start on paper, and it is not a prerequisite for the Selective test. Plenty of selective-school students never did OC, and not every OC student receives a Selective offer. The reason to look at the two together is practical, not procedural: if your child does aim for both, the later test adds writing, and that is the part worth planning for early.
What Carries Over: Three of the Four Subjects
The good news for an OC family looking ahead: most of what you build for OC is not wasted. Three of the four Selective test sections cover the same skill areas, at a harder level and sat two years older:
- Reading → Reading (comprehension, inference, vocabulary; tougher texts at Selective)
- Mathematical Reasoning → Mathematical Reasoning (applying maths to unfamiliar problems)
- Thinking Skills → Thinking Skills (critical thinking and problem solving)
Because the skill areas overlap, OC-style reasoning stays familiar going into Selective. Two honest caveats: the two tests are marked separately, so an OC result does not carry into the Selective outcome, and doing well on one does not guarantee the other (a different, older cohort and harder questions). What transfers is the practice, not the score.
What Doesn't: The Selective Writing Paper
Here is the difference most OC-vs-Selective guides mention in a line and move past: the Selective test's fourth section is Writing, and there is nothing like it on the OC test. On the Selective test it is a single 30-minute task, worth a quarter of the result. It is marked against two official criteria sets, Set A (content, appropriate form, organisation and style) and Set B (sentences, punctuation and spelling). For what each looks for in plain English, see our NSW Selective writing marking criteria guide.
Three reasons the Selective Writing section catches families out:
- It is the only entirely new demand. Reading, maths and thinking skills a family has been building since OC. Writing they may not have touched at all.
- It tends to build slowly. A maths topic can be drilled in a couple of weeks. Writing usually grows over reading widely, writing regularly, and getting feedback on real pieces, which is hard to compress into a final term.
- It is worth as much as any other section. Not a tiebreaker. On the Selective test it is 25%, the same as the maths a family may have spent two years on.
Every time this guide says "writing", it means the Selective Writing paper, sat in Year 6 for Year 7 entry. The OC test in Year 4 has no writing at all, and nothing below is preparation for the OC test.
What the Selective Writing paper actually asks, and how it is marked, is its own subject: see the marking criteria guide, the genre guides for narrative, persuasive and informative writing, and what a good Selective writing score really means.
So When Should an OC Family Start Writing?
The timeline is the argument. A child sits OC in Year 4 and, if aiming for a selective high school, sits the Selective Writing task in Year 6. Worth noting: for a child who wins an OC place, that Year 6 is the second year of the opportunity class itself, so the writing section arrives during OC, not comfortably after it. Writing is the kind of skill that tends to reward steady time and resist last-minute cramming, because it grows from reading, regular practice, and feedback rather than from drilling a single topic.
That does not mean drilling exam essays in Year 4. It means keeping writing alive, wide reading, short regular pieces, and honest feedback, so that when Selective-specific writing preparation starts, there is something to sharpen rather than build from nothing. For a home routine, see how to improve selective writing at home; for the genres and what markers reward, the guides above. (All of that is for the Selective Writing paper in Year 6, not the OC test.)
Preparing for OC right now? There is no need to drill Selective essays in Year 4. Wide reading and occasional low-pressure writing is plenty at this stage.
Closer to the Selective test? Paste a recent piece and get an out-of-25 practice estimate with a six-area diagnostic breakdown, and the exact lines to fix, in about 30 seconds. Free, no signup.
The six-area breakdown is EurekaWrite's practice feedback tool, built on the Selective writing criteria; it is not an official NSW score report.
Score a piece of writing →Frequently Asked Questions
Does the OC (Opportunity Class) test include writing?
No. The Opportunity Class placement test has three papers, Reading, Mathematical Reasoning and Thinking Skills, and no writing component. Only the Selective High School Placement Test, sat two years later in Year 6, adds a Writing paper.
What is the difference between the OC and Selective tests?
The OC test is sat in Year 4 for Year 5 entry to an opportunity class, and has three papers with no writing. The Selective High School Placement Test is sat in Year 6 for Year 7 entry, and has four papers, each worth 25%, the extra one being Writing.
Does OC preparation transfer to the Selective test?
Mostly. Three of the four Selective papers, Reading, Mathematical Reasoning and Thinking Skills, build on the same skills as OC, at a harder level. The fourth, Writing, is entirely new and does not carry over.
Is the Selective test harder than the OC test?
It is longer, aimed at students two school years older, draws on curriculum concepts up to Year 6 rather than Year 4, and adds a 30-minute Writing task. Whether it is harder to win a place, though, depends on the applicants, the number of places and school preferences in a given year, not on the test format alone, so the two cannot be ranked by difficulty from their structure.
Is OC placement required to sit the Selective test?
No. The two are independent, and a child can sit the Selective test without ever having done OC. Many OC students do go on to sit Selective, which is why the writing gap between the two is worth planning for.
When should a child start practising writing for the Selective test?
As early as is sustainable. Writing is the slowest skill on the Selective test and cannot be crammed. The roughly two years between the Year 4 OC test and the Year 6 Selective test is the window to build it, through wide reading and regular, low-stakes practice.
Free first analysis. Out-of-25 practice estimate with a six-area breakdown, in about 30 seconds.