Why people fail reasoning tests and how to fix it

Most candidates fail reasoning tests for five specific reasons: reading errors, time panic, assumption creep, method gaps, and inconsistent practice. Each failure mode has a trainable fix — and most people only need to address one or two to pass. Use this after a baseline test, then move to wrong-answer review and time management.

Find the failure pattern before doing more practice. Start diagnostic

What to focus on first

Common traps

• Blaming ability. A vague diagnosis creates vague practice.
• Doing another mock immediately. Review has to happen before volume.
• Ignoring slow correct answers. They are often future wrong answers under tighter timing.

How to practise from here

After your next timed set, sort every miss into the five failure modes on this page. Practise only the biggest category in the next session.

The uncomfortable truth about reasoning tests is that most failures are not caused by a lack of ability. They are caused by a lack of preparation — specifically, by never identifying which mistakes you keep making.

1. Reading errors

You read the wrong row in a table, miss the unit label (thousands vs millions), or confuse what the question is actually asking. This is the single largest failure category across all reasoning types.

Fix: Before calculating, physically underline or point to the specific data you need. Say the unit out loud in your head: “this column is in thousands.”

2. Time panic

You see the clock running down, panic, and start rushing through questions without properly reading them. The result is a cascade of errors in the final third of the test.

Fix: Know your target pace before you start. If a question takes more than 1.5x your target, skip it and return later. The easy marks at the end are worth more than the hard question you are stuck on.

3. Assumption creep

Especially in verbal reasoning: your brain fills in information that the passage does not contain. A statement feels “probably true” based on your general knowledge, so you pick True when the correct answer is Cannot Say.

Fix: Ask yourself: “Is this exact claim in the passage?” If you cannot point to the specific sentence, the answer is Cannot Say.

4. Method gaps

You do not know the fast method for a question type. For example, using long division instead of the 10%-building shortcut for percentage questions, or trying to hold two hypotheses at once in a logical reasoning sequence.

Fix: Learn the standard methods for each question family before practising. Drill them in isolation until the method is automatic, then mix.

5. Inconsistent practice

A long cramming session the night before is less effective than 30 minutes daily for two weeks. Your brain needs sleep between sessions to consolidate pattern recognition.

Fix: Set a recurring 30-minute block and stick to it. Track your error categories after every session. You will see measurable improvement within a week.

What to do after you find the failure mode

Pick the matching drill, not the most comfortable one. Reading errors need slower first-pass evidence checks. Time panic needs shorter timed sets and skip rules. Method gaps need one question family at a time: percentages, Cannot Say, or pattern families.

Source notes

forge checks preparation advice against official candidate guidance from SHL’s practice test pages and Aon’s online assessment preparation page.

Frequently asked questions