OC vs Selective: What's the Difference?
Stand in any school pickup line where parents are comparing notes on gifted-and-talented programs and you'll hear "OC" and "Selective" used as if they're the same thing. They're related, but they're genuinely different, and the difference shapes how and when you prepare.
The Opportunity Class (OC) test
Sat in Year 4, the OC test is for entry into an Opportunity Class for Years 5 and 6, a stream within certain primary schools for high-achieving students. In syllabus terms these children are partway through Stage 2, so the maths draws on content up to roughly Year 4 level.
The Selective High School test
Sat in Year 6, this test is for entry into a fully selective high school from Year 7. These students are in Stage 3, and the content reaches up to about the first half of Stage 3, roughly Year 5 material. For most families it's the higher-stakes of the two, because it decides secondary schooling.
Same engine, different gear
Both tests use the identical Mathematical Reasoning format, 35 questions, 40 minutes, five options, no penalty for a wrong answer. What differs is the content ceiling and the child's age, not the style of thinking being tested.
What this means if you have a younger child
Here's the part parents find most useful. Because both tests reward the same underlying skill, reasoning through unfamiliar, multi-step problems under time pressure, preparation transfers almost completely. A Year 3 or 4 child building those muscles for the OC test is, without doing anything extra, laying the exact groundwork the Selective test will reward two years later.
So if you're wondering whether early practice is "wasted" should your child not sit OC, the honest answer is no. The reasoning habit is the asset. The specific test is just the occasion it gets used.
Selective Edge is not affiliated with the NSW Department of Education or the Selective High Schools Test administrators. This guide is general information for parents, drawn from publicly available test materials.