How to Prepare for Aon in 24 Hours

If your Aon assessment is within the next 24 hours, your goal is not to master every possible Aon or cut-e format. Your goal is to reduce avoidable mistakes, understand the likely test types, practise under realistic time pressure and enter the assessment calm enough to follow instructions. A focused plan beats panic practice.

Aon assessments can include short ability tests, game-style challenges, situational judgement tasks and personality or work-style questionnaires. The exact combination depends on the employer. Aon’s candidate preparation material lists examples such as scales eql for basic numerical comprehension, digitChallenge for numeracy, gridChallenge for working memory, motionChallenge for planning, chatAssess for work-related judgement, scales e3+ for concentration, and logic tests such as scales ix, scales clx, gapChallenge and switchChallenge. Many of these are short and timed, so the biggest preparation mistake is spending hours reading generic advice without doing timed practice.

Aon assessment invitations can include different combinations of short ability tests, game-style challenges, situational judgement tasks and personality/work-style questionnaires. Aon’s current candidate preparation material lists several named formats and gives candidates an important expectation: many individual ability and challenge tests are short, timed, and designed so that speed, accuracy and calm rule-following matter. Examples listed by Aon include chatAssess at about 20 minutes, scales eql at about 5 minutes, gridChallenge at about 9 minutes, motionChallenge at about 6 minutes, scales e3+ at about 2 minutes, digitChallenge at about 6 minutes, scales ix at about 5 minutes, scales clx at about 6 minutes, gapChallenge at about 6 minutes and switchChallenge at about 6 minutes. That does not mean every employer uses every module. It means the exact assessment length depends on the assessment battery configured for the role.

Because Aon assessments are modular, candidate advice should avoid pretending that there is one universal Aon test. A graduate finance candidate may receive numerical and logical tasks. A technical or operations candidate may see concentration, planning or working-memory challenges. A customer-facing or management-track candidate may receive situational judgement or personality-style content. Some employers combine several modules; others use only one or two. The safest candidate-facing advice is therefore to read the invitation carefully, check whether the employer has named any test types, and prepare across the ability area most likely to appear for the role.

Step 1: Read your invitation carefully

Before practising, read the invitation again. Look for the provider name, test names, deadline, device requirements, calculator rules, whether the assessment must be done in one sitting, whether there are practice examples, and whether any proctoring or identity checks are mentioned. Many candidates waste time preparing for the wrong thing because they skim the email and only remember the word “Aon.”

If the invitation names a specific module, prioritise that module. If it only says “Aon online assessment,” infer from the role but keep your preparation broad. Analytical roles are more likely to involve numerical and logical reasoning. Technical, operations or planning roles may involve concentration, memory or planning challenges. Graduate schemes may combine several modules. Customer-facing or leadership-track roles may include situational judgement.

Step 2: Build a realistic 24-hour schedule

A strong last-day schedule has four blocks.

First, spend 20 minutes understanding the likely format. Do not disappear into forums for hours. You need enough context to avoid being surprised, not endless anecdotes.

Second, spend 60–90 minutes practising the most likely ability area. If numerical, practise percentages, ratios, table reading, mental calculation and estimation. If logical, practise patterns, rule changes, exclusions and short timed sets. If game-style challenges are likely, practise working-memory and concentration tasks.

Third, spend 30–45 minutes reviewing mistakes. This is the highest-value part. Write down whether each error came from misunderstanding the instruction, rushing, weak arithmetic, missing a visual rule, losing track of information or spending too long on one item.

Fourth, stop heavy practice and prepare your environment. A tired, overtrained candidate may perform worse than a rested one.

Step 3: Practise speed without becoming reckless

Many Aon-style modules are short. That means you need a pacing strategy. However, “go faster” is incomplete advice. Speed without accuracy just creates a larger number of wrong answers. The useful target is controlled speed: solve easy items quickly, recognise difficult items sooner, and avoid emotional attachment to one question.

During practice, use a timer. Work in short bursts that resemble the real module length. After each burst, review errors slowly. This contrast is important: fast solving, slow review. Practising slowly all day will not prepare you for time pressure, but practising quickly without review will not teach you anything.

Step 4: Prepare by module type

For numerical and mental-calculation modules, practise percentages, fractions, ratios, basic arithmetic, averages and quick estimation. Aon’s scales eql and digitChallenge descriptions emphasise mental calculation and solving as many tasks as possible. You should be comfortable doing simple calculations without freezing.

For logical modules, practise identifying rule types. Look for changes in shape, size, colour, rotation, position, number sequence, symbol order and exclusion rules. For switchChallenge-style tasks, practise rule application rather than pure pattern matching. The goal is to become faster at asking, “What is changing and what stays constant?”

For working-memory and concentration modules, practise short focus drills. These tests can feel easy at first, then punishing when your attention slips. The key is not only intelligence; it is maintaining accuracy while processing information quickly.

For chatAssess or SJT-style content, practise reading the scenario carefully, identifying the workplace problem and choosing responses that are constructive, professional and proportionate. Avoid extreme responses unless the scenario clearly requires escalation.

For personality or work-style questionnaires, do not try to fake a perfect profile. Think about the role and answer consistently. Employers are usually looking for fit and behavioural tendencies, not heroic perfection.

Step 5: Use TestSolve for explanation-based practice

TestSolve is useful when you are practising sample questions and need to understand why your answer was wrong. That is different from simply checking whether you got the answer. For example, if you miss a logical pattern, TestSolve can help identify the rule you overlooked. If you make a numerical mistake, it can show whether the issue was calculation, setup, percentage logic or reading the table. If you misunderstand a question stem, it can help you see the instruction more clearly.

In the final 24 hours, you should use TestSolve to reduce repeated errors, not to create a false sense of security. The best use is: attempt a sample question yourself, then review the explanation, then practise a similar item under time pressure.

Step 6: Avoid the worst last-minute mistakes

Do not spend the entire evening reading other candidates’ stories. Community reports can make you anxious because they mix different employers, roles, countries and test versions. One person’s Aon experience may not match yours.

Do not ignore the instructions. Aon-style tasks often have unusual interfaces or rules. The practice example is part of the test-taking skill. Read it.

Do not practise only untimed. If your real module is timed, your preparation should include timed work.

Do not stay up late cramming. Cognitive tests punish fatigue. Sleep is part of preparation.

Do not use live assistance, answer leaks or another person’s help. That risks violating the employer’s assessment rules and can damage your application.

Test-day setup

Use a reliable device, stable internet, a quiet room and a browser compatible with the assessment platform. Close distracting apps. Keep your invitation email accessible. Have water nearby. Start early enough that you are not racing the deadline. If the platform gives practice examples, complete them seriously. They teach the interface and may prevent avoidable mistakes.

If something goes wrong technically, document it immediately and contact the official support route. Do not keep restarting randomly.

A simple four-hour version

If you only have a few hours, compress the plan. Spend 15 minutes reading the invitation and identifying likely modules. Spend 45 minutes on the most likely ability area. Spend 20 minutes reviewing mistakes. Spend another 30 minutes on a second timed set. Then stop and prepare your environment. This is not ideal, but it is better than unfocused panic.

The mistake many candidates make is trying to “cover everything.” Aon’s assessment ecosystem is broad, and trying to learn every named module in one evening can leave you more confused. A narrow plan is more valuable: one primary test type, one secondary test type, and a clean test-day setup.

How to choose what not to practise

If your role is heavily numerical, do not spend most of the evening on personality questionnaires. If your role is customer-facing and the invitation mentions judgement or scenarios, do not spend all your time on abstract patterns. If the invitation includes a named challenge, prioritise that challenge. Good last-minute preparation is partly the art of ignoring lower-probability content.

You should also avoid over-practising the easiest thing. Candidates often repeat the question type that feels comfortable because it builds confidence. That is pleasant, but it does not fix the bottleneck. Your final practice should target the area most likely to cost you marks.

Final-hour checklist

In the final hour before the assessment, do not start a new heavy study session. Check your device, browser, internet, charger, ID or reference information, invitation email and quiet room. Close unnecessary tabs. Put your phone away unless needed for authentication. Take a short break. Read the instructions carefully when the test begins. A calm candidate who follows the interface rules can outperform a more knowledgeable candidate who rushes the first screen.

Summary 24-hour plan

The best last-day Aon plan is simple: identify likely modules, practise the most relevant skill, time yourself, review mistakes, prepare your environment and rest. You do not need to become perfect overnight. You need to become calmer, faster at the basics, and less likely to lose marks through avoidable errors.

TestSolve should be positioned as a preparation and explanation tool. A candidate can use it to practise sample questions, understand why an answer is correct, review mistakes and build confidence before the real assessment. It should not be positioned as live-test assistance, impersonation, automation or a way to bypass the employer’s assessment rules. Aon and employers may use integrity controls, and candidates should follow the instructions in their invitation.

Frequently asked questions

TestSolve is independent and not affiliated with any test provider or employer named on this page. All product names and trademarks belong to their respective owners.