Why You Keep Failing the Numerical Test

You did the free practice questions. You revised percentages and ratios. You thought you were ready. Then the timer started and something went wrong.

The publicjobs numerical reasoning test catches people off guard not because the maths is difficult but because specific traps compound each other under pressure. Here are the five most common reasons candidates fall short, and what to do about each.

1. You are running out of time before you run out of questions

This is the single biggest complaint you will find from Irish candidates who have sat the aptitude tests.

“I only got about four questions done in the maths.” “You won’t get it all done, they don’t give enough time.” These are real things real people write after sitting the assessment.

Here is the context: for the Clerical Officer competition, the numerical section has 18 questions in 22 minutes. For Executive Officer, it steps up to 36 questions in 35 minutes. That works out to roughly a minute per question, and each question requires you to locate the right figure in a table or chart, apply a calculation without a calculator, and pick from five options. Under those conditions, running out of time is not failure - it is the design of the test.

The test is intentionally speeded. Many candidates do not finish, and your score is ranked against all other candidates in the Order of Merit. So the goal is not to finish: it is to answer more correctly than the person ranked just above you.

The fix is not to go faster. It is to triage. Spend ten seconds on a question. If you cannot see a route through it quickly, mark your best guess and move on. A half-done calculation abandoned mid-way costs you more time than skipping it entirely.

2. You are misreading the charts in a rush

The questions are built around statistical tables and charts. You are not being asked to do complex maths; you are being asked to extract the right number from the right row, then apply a percentage or ratio to it.

When you are panicking over the clock, it is very easy to pull a figure from the wrong column or misread which year a bar chart is showing. That is a reading error caused by pressure, not a maths error, and it is one of the most common sources of wrong answers.

The fix is a habit. Before you do any calculation, find the axis labels, confirm the unit (thousands, millions, percentages), then locate the exact cell or data point you need. Five seconds of orientation saves you from confidently calculating the wrong thing.

If you want to understand how the data presentation in Irish competitions differs from UK-style numerical tests, the publicjobs.ie numerical reasoning test guide covers the cut-e format used across CO, EO and HEO grades. For a direct comparison of what makes the Irish test different from SHL practice material, publicjobs vs UK SHL numerical tests goes into the specifics.

3. You are shaky on percentages and ratios under pressure

The skills required are: percentages, ratios, averages, and basic arithmetic applied to data. That is it. No algebra, no quadratics, no logarithms.

But “basic maths” and “basic maths under pressure with no calculator in under a minute” are different things. Candidates who are comfortable with these calculations at the kitchen table can freeze when the format is unfamiliar and the clock is running.

The specific operations that trip people up:

Percentage change: (new minus old) divided by old, multiplied by 100. A lot of candidates mix up the denominator.
Ratios across multiple columns: when a question asks you to compare two figures expressed as a ratio, you need to simplify quickly in your head or on your scrap paper.
Averages from grouped data: finding the mean when the data is presented in categories, not as a list.

The fix is repetition in timed conditions. Not reading about how to do it. Actually sitting down, setting a timer, and doing question after question until the method is automatic. The candidates who describe “flying through it” or “finishing with time to spare” are not necessarily more intelligent: they have done enough practice that the calculations feel routine.

4. You are practising on the wrong material

A lot of popular numerical reasoning prep is built for UK civil service competitions: SHL-style tests with pound sterling figures, different timing, and question formats that do not map to what publicjobs.ie actually delivers. If you have been using a UK prep site and the real thing felt different, that is why.

The publicjobs numerical test is delivered by cut-e (now part of AON). The format involves reading data from tables and charts and choosing one correct answer from five options. No calculator. Questions in euro. Timing specific to each grade.

Practising on mismatched material means you build familiarity with the wrong thing. The fix is Irish-specific practice that matches the actual format: euro-denominated data, timed to CO or EO conditions, and structured around the cut-e interface.

5. You do not know where you stand relative to other candidates

There is no publicly disclosed pass mark for the numerical reasoning test. You are not pass or fail: you are ranked. Your score determines your Order of Merit position, which determines how quickly you are offered a post.

“Good enough” is a moving target depending on how many people applied and how competitive the intake is. A decent raw score in a large CO competition might still place you far down the panel.

The practical implication: maximise your score, do not just clear an imaginary bar. Every correct answer is a marginal gain in ranking. That is why triage works better than grinding a hard question until time runs out.

FAQ

Does your numerical score affect your place on the panel?

Yes, directly. Your aptitude test score determines your Order of Merit ranking, and your position on that panel determines how quickly you are called forward for a post. There is no separate pass mark: it is your score relative to every other candidate who sat the same test.

Can I use a calculator in the publicjobs aptitude test?

No. Calculators are not permitted. You are allowed scrap paper only. This is why practising mental arithmetic under timed conditions, particularly percentages and ratios, matters more than it might seem.

Did anyone finish all the numerical questions in time?

Some candidates do finish, particularly those who have done a lot of targeted practice. But it is normal not to finish. The test is designed to be speeded, meaning time pressure is deliberate. Many candidates who report doing well on the numerical section did not complete every question - they answered the questions they attempted correctly and moved on efficiently.

Is the numerical test the same for CO and EO?

The format is similar, but the volume and time limit differ. The CO numerical section has 18 questions in 22 minutes. The EO version has 36 questions in 35 minutes. Check publicjobs.ie directly before your competition, as formats can vary. For HEO and AO levels, the test may differ further - always check the competition-specific information on publicjobs.ie.

Where to go from here

The publicjobs.ie Self-Assessment System gives you free timed practice for CO, EO, and AO levels with answer explanations. Start there.

When you are ready to practise with material that is built specifically for the Irish format - euro figures, ranked-answer SJTs for the competency section, and numerical questions timed to the CO and EO formats - the free taster at PublicServicePathway is a good next step. No card required. Try it at psp-taster.pages.dev and see whether it covers the gaps your current prep is missing.

The maths itself is not the hard part. The pressure, the format, and the ranking system are the hard part. Practise accordingly.

Why You Keep Failing the Numerical Reasoning Test (and How to Fix It)