OC Test Maths Checklist: What to Master Before Year 5
The NSW OC (Opportunity Class) test is sat in Year 4, for entry into an Opportunity Class in Years 5–6. Its Mathematical Reasoning section doesn't test advanced topics — it tests whether a child can apply primary maths confidently and quickly. Use this checklist to find the gaps before test day.
Tip: a skill only counts if your child can do it quickly and explain it — not just get there eventually with help.
Number & place value
- Read, write and order numbers to at least 10,000
- Round to the nearest 10, 100 and 1,000
- Add and subtract multi-digit numbers fluently
- Times tables to 12 × 12, recalled quickly
- Multiply and divide by single digits (with remainders)
- Multi-step word problems (two or three steps)
Fractions, decimals & money
- Recognise and compare simple fractions (1/2, 1/3, 1/4, 1/5)
- Find a fraction of a quantity (e.g. 3/4 of 20)
- Equivalent fractions (1/2 = 2/4 = 5/10)
- Decimals to two places, and add/subtract them
- Money: make totals and give change
- Simple ratios (e.g. 2 for every 3)
Measurement & time
- Length, mass and capacity with correct units
- Perimeter and area of rectangles (and the difference between them)
- Read analogue and digital clocks; elapsed time
- Convert between units (cm/m, minutes/hours)
Geometry & space
- Name 2D shapes and 3D solids by their properties
- Lines of symmetry
- Angles: right, acute, obtuse
- Simple grid coordinates and directions
- Basic transformations (flip, slide, turn)
Data & chance
- Read tables, picture graphs, column graphs
- Answer 'how many more / fewer' from a graph
- Describe chance in everyday language (likely, even, impossible)
Reasoning (the OC differentiator)
- Continue and describe number and shape patterns
- Work backwards from an answer
- Spot the odd one out and justify why
- Solve problems with more than one step, under time
How to use this checklist
- Go through it together and mark anything shaky — those are your practice priorities.
- Reasoning (the last group) is what separates OC candidates — spend the most time there.
- Re-test the shaky items a week later. Confidence + speed is the goal, not just correctness.
When you're ready to drill the gaps, PrepPath has free OC Mathematical Reasoning practice — unlimited questions, each explained, with an AI Tutor for the tricky ones. See also our OC & Selective prep plan and OC Maths practice questions.
PrepPath is an independent educational platform and is not affiliated with ACARA or the NSW Department of Education. This guide is general information only — always check the official ACARA (nap.edu.au) or NSW Department of Education websites for current dates and rules.