OC vs Selective test: what's the difference?
OC vs Selective is one of the first questions Western Sydney parents ask. The two NSW placement tests are run by the same department, look similar and are both held in May. But they're for different year levels, lead to different placements, and the Selective test has a writing section that the OC test doesn't. This guide sets out the differences side by side, using the NSW Department of Education's published test format. It also covers what that means for preparation.
Side by side
| Comparison | Opportunity Class (OC) test | Selective High School test |
|---|---|---|
| Leads to | An opportunity class in Years 5 and 6 at a primary school | A place at a selective or partially selective high school from Year 7 |
| Child sits it in | Year 4 | Year 6 |
| Apply | November to February (Year 3 into Year 4) | November to February (Year 5 into Year 6) |
| Test held | Early May, computer-based | Early May, computer-based |
| Sections | Reading, Mathematical Reasoning, Thinking Skills | Reading, Mathematical Reasoning, Thinking Skills, Writing |
| Reading | 14 questions (some multi-part), 40 min | 17 questions (some multi-part), 45 min |
| Mathematical Reasoning | 35 questions, 40 min | 35 questions, 40 min |
| Thinking Skills | 30 questions, 30 min | 40 questions, 40 min |
| Writing | None | 1 task, 30 min |
| Weighting | Each section 33.3% | Each section 25% |
| Calculator | Not allowed | Not allowed |
Source: NSW Department of Education, Placement test, Opportunity class practice tests and Selective high school practice tests pages (checked 22 Oct 2026). Dates and formats are confirmed each year, so check the key dates for your child's entry year.
What the differences mean for preparation
The writing section is the biggest difference.
It's worth a quarter of the Selective result, and the OC test has nothing like it. The Department says writing is marked on the creativity of ideas and on writing effectively for a purpose and audience, and that a response that doesn't address the topic is marked lower. That skill takes time to build. Selective preparation usually needs a writing component well before Year 6.
Thinking skills get longer.
The Selective thinking skills section has 40 questions in 40 minutes, against 30 in 30 for OC. The pace is the same, but holding concentration for longer is a skill in itself.
Neither test asks for content beyond the curriculum.
The Department says the questions draw on what children already learn at school. Preparation is about applying skills to unfamiliar questions, reading carefully on screen and working at test pace, not racing ahead through the syllabus.
Doing the OC test first can help with Selective.
A child who sat the OC test in Year 4 has already seen the format, the computer-based delivery and the test-day routine. That's useful two years later, whatever the OC result was.
When to start
- OC: the test is in early May of Year 4, so the application window (November to February) is a natural point to plan preparation.
- Selective: our Selective & OC program covers Years 4 to 6, so reading and writing can be built in Year 4 or 5, then timed, test-format practice in the terms before the May test in Year 6.
Starting late isn't wasted. Even a term of format-focused practice helps a child avoid losing marks to the unfamiliar. But skills like reading stamina and writing take longer to build than test technique.
Frequently asked questions
Can my child sit both tests?
- They're for different year levels, so a child can sit the OC test in Year 4 and the Selective test in Year 6. Each needs its own application.
Does an OC place guarantee a Selective place?
- No. Selective places are decided by the Selective test, which is a separate process.
Is the OC test harder than the Selective test?
- They're set for different ages. The Selective test is longer and adds writing, but each is pitched at the year level that sits it.
Do we need a tutor?
- Not necessarily. The Department publishes free practice tests, and they're the place to start. Tutoring helps when you want a structured plan, feedback on writing, or help with a specific weak section.
How Excel Tutoring Academy can help
Our Selective & OC preparation covers Years 4 to 6: see OC preparation for the Year 4 OC test and Selective school tutoring for the Year 6 Selective test. Both are one-on-one or small group, online or at your home across Wentworthville and Western Sydney. Call 0433 856 817.
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