AON Grid Challenge: visual attention, rules and practice strategy

The AON Grid Challenge is usually best approached as a visual attention test. The goal is not to think deeply; it is to apply a simple rule accurately across a busy display.

Source note: forge checks provider-format guidance against official candidate resources from SHL, Aon, HireVue and, where relevant, public employer process pages. Provider names, challenge labels and timing can still change by country, role and intake, so use your invitation email as the final source before choosing a drill.

Grid-style tasks are about controlled speed. Practise scanning patterns, not random clicking. Open timing guide

AON Grid Challenge practice route map

Use this table to turn the article into a drill plan. The goal is not to read every guide; it is to match the wording in your invite to the nearest format, take a timed baseline, and then practise the exact weakness that shows up.

How to prepare from here

Treat this page as the map, not the practice itself. First, match the wording in your invitation email to the closest provider or question family. Then take one short timed set before doing any more reading. That baseline tells you whether the real problem is speed, accuracy, unfamiliar interface, or a specific trap such as wrong-base percentages, cannot-say overreach, or single-feature pattern matching.

Once you know the weak spot, practise narrowly. Ten mixed mocks can feel productive, but they often hide the pattern. Three focused drills on the same mistake usually move the score faster. After that, run one full timed attempt and review both wrong answers and slow correct answers. Slow correct answers matter because they steal time from later questions.

• Confirm the exact format. Read the invitation email and test portal carefully before you practise. Provider names, timing and section mix can change by employer and role.
• Take a timed baseline. Do one short timed set in the closest format, then mark the questions you missed or answered too slowly.
• Drill the weakest pattern. Spend most of your prep time on the recurring error type, not on random extra mocks.
• Run a realistic mock. Before the real assessment, practise under the same timer, calculator rules and environment you expect on test day.

Common mistakes to avoid

The biggest mistake is preparing for a generic aptitude test when the employer has named a specific provider. SHL, AON, Cappfinity, Talent Q, HireVue-style video interviews and employer job simulations all reward different habits. The skills overlap, but the timing, interface and answer style can change enough to make generic prep inefficient.

• Ignoring the invite wording. A few words in the email often reveal the exact test family.
• Practising untimed for too long. Untimed practice teaches method; timed practice teaches performance.
• Reviewing only the final score. The useful data is why you missed each question.
• Overfitting to one employer rumour. Providers change by country, role and intake, so keep the caveat in mind.
• Leaving the next stage too late. If the online test goes well, video interview or assessment-centre prep often follows quickly.

What forge sees candidates confuse

The repeat pattern is mistaking a broad provider label for a specific task. A candidate may remember AON, SHL, Cappfinity or Talent Q, but the useful clue is the second label: numerical, verbal, inductive, strengths, calculator, Digit, Grid, Gap or another named section. That second label decides the practice route.

When practice stalls, tag the error before doing another mock. Use simple labels: wrong data, wrong base, over-reading, missing qualifier, one-feature pattern match, slow correct answer, or judgement mismatch. The next drill should target the most common label, not the topic that feels most familiar.

How forge reviews this practice

forge review starts with the attempt, not the topic label. A missed question is tagged by the thing that actually cost the mark: setup, data lookup, inference, timing, interface surprise or judgement. A correct answer can still be tagged if it took too long, because a slow correct answer often creates the next wrong answer later in the test.

The limitation is that public provider guidance rarely confirms every employer setup. That is why these guides separate the transferable skill from the employer rumour. Use the page to choose a first drill, then let the official invite and portal examples decide the final format before you sit the real assessment.

When to switch guides

Switch guides as soon as your evidence changes. If the invitation mentions SHL Verify, use the SHL guides. If it says AON, cut-e, scales or a named challenge such as Switch, Digit or Grid, use the AON guides. If it describes strengths, realistic work scenarios or a job simulation, add SJT and strengths-based preparation. If the page you are reading does not match the wording in your portal, trust the portal.

A useful rule is to keep the provider fixed while you practise a weak skill. Switching between providers too early makes it harder to tell whether the problem is the skill, the interface or the timer. Once your accuracy is stable in one format, then add the adjacent provider so the real test does not feel unfamiliar.

Related guides

• AON assessments hub
• AON Switch Challenge
• SHL vs AON

Frequently asked questions