Watson Glaser Critical Thinking Test: How to Prepare and Pass

The Watson Glaser Critical Thinking Appraisal (Watson Glaser III) is a timed psychometric test consisting of 40 questions across five sections. Most candidates complete it online as part of a law firm's application process, typically after the initial application form has been reviewed.

Each section tests a distinct aspect of critical thinking:

The total test typically takes around 30 minutes, though some firms allow slightly more time. Always check the specific instructions from the firm administering your test.

The Watson Glaser III is an adaptive version of the test, meaning the difficulty of questions may adjust based on your responses. Your score is normed against a comparison group, so you are ranked relative to other candidates rather than against an absolute pass mark.

The Watson Glaser is one of the most common psychometric tests in UK legal recruitment. It is used predominantly by large commercial firms, though some mid-size and specialist firms also include it in their process.

Firms regularly change their recruitment processes. Always check the firm's graduate recruitment page for the most up-to-date information before applying.

If you are applying to multiple firms that use the Watson Glaser, investing time in preparation is particularly worthwhile - the same skills will serve you across several applications.

Each section of the Watson Glaser tests a different skill, and each benefits from a targeted preparation approach.

1. Inference

This section gives you a passage of factual information and asks you to judge statements as true, probably true, insufficient data, probably false or false. The key challenge is resisting the urge to bring in outside knowledge. Base your answers solely on the passage provided. Practise by reading news articles and asking yourself what can and cannot be concluded from the facts stated - nothing more.

2. Recognition of Assumptions

You are given a statement and must decide whether a proposed assumption is necessarily taken for granted. The word "necessarily" is critical. An assumption must be an essential, unstated premise of the statement - not merely something that might be true. A common mistake is marking assumptions as "made" when they are merely plausible rather than logically required.

3. Deduction

This section works like a syllogism exercise. You are given two premises and must decide whether a conclusion logically follows. Treat the premises as absolutely true, even if they seem unrealistic. Ignore real-world knowledge entirely and focus purely on the logical structure. Drawing Venn diagrams can help you visualise whether the conclusion is valid.

4. Interpretation

Similar to the inference section, but here you must decide whether a conclusion follows "beyond a reasonable doubt". The threshold is higher than for inference. Read the passage carefully and ask: does the evidence strongly support this conclusion, or does it merely suggest it? If there is any reasonable alternative explanation, the conclusion does not follow.

5. Evaluation of Arguments

You are presented with a question and several arguments for or against. You must decide whether each argument is "strong" or "weak". A strong argument must be both directly relevant to the question and of genuine importance. Arguments that are emotional, anecdotal, or tangential are weak - even if you personally agree with them. Practise by evaluating opinion pieces and identifying which arguments are substantive and which rely on rhetoric.

Preparation makes a measurable difference on the Watson Glaser. Here are the main resources available:

Free options: - Pearson TalentLens sample test - the official publisher provides a free sample Watson Glaser test on their website, which is the closest you will get to the real format - AssessmentDay Watson Glaser practice - a free set of Watson Glaser-style questions with explanations - WikiJob Watson Glaser guide - includes free practice questions and walkthroughs for each section - University careers services - many UK university law departments and careers services offer Watson Glaser workshops and practice packs, often for free

Paid options: - Pearson TalentLens official practice bundle - the most accurate practice tests, typically around £15-£25 - JobTestPrep Watson Glaser pack - timed practice tests with detailed answer explanations - AssessmentDay premium pack - additional timed tests beyond the free offering

General critical thinking practice: - LSAT logical reasoning sections - freely available past papers that develop the same analytical skills - Philosophy logic primers - introductory logic textbooks cover deduction and inference in depth - Broadsheet editorial sections - regularly reading and critically evaluating arguments in publications like The Economist, the Financial Times or The Guardian builds the habits tested by the Watson Glaser

Aim to complete at least three full practice tests under timed conditions before sitting the real thing.

The Watson Glaser is a timed test, and many candidates report feeling time pressure. Here are practical strategies for test day:

• Read the instructions carefully. Every Watson Glaser section has specific instructions and response scales. Misunderstanding the scale (for example, confusing "probably true" with "true") will cost you marks across multiple questions.
• Manage your time per section. With roughly 30 minutes for 40 questions, you have under a minute per question on average. Do not spend more than 90 seconds on any single question - mark your best answer and move on.
• Read the passage first, then the question. For inference, interpretation and deduction sections, reading the passage carefully before looking at the statements reduces the need to re-read.
• Eliminate your personal opinions. This is the single most important skill. The Watson Glaser specifically tests whether you can set aside what you believe and assess information objectively. If you find yourself thinking "but that's obviously true because...", you are probably drawing on outside knowledge.
• Choose a quiet environment. Since most candidates take the test online at home, find a distraction-free space. Close all other browser tabs. Ensure your internet connection is stable.
• Take the test when you are alert. Avoid late evenings or times when you are fatigued. Critical thinking performance drops measurably when you are tired.
• Do not overthink. Your first analytical instinct is often correct. Candidates who second-guess themselves frequently change right answers to wrong ones.

These are the errors that trip up the most candidates:

1. Using outside knowledge. The Watson Glaser tests whether you can reason from the information provided - not whether you know about the topic. If a passage says the sky is green, treat it as true for the purposes of the question.
2. Confusing the response scales. The inference section uses a five-point scale (true, probably true, insufficient data, probably false, false), while other sections use two-point scales. Mixing these up is a common source of errors.
3. Defaulting to "insufficient data" too often. Many candidates use this as a safe option when unsure. While it is sometimes correct, overusing it suggests you are not engaging with the passage deeply enough.
4. Treating plausible assumptions as necessary assumptions. In the assumptions section, an assumption must be logically required by the statement - not merely compatible with it.
5. Judging arguments by whether you agree with them. In the evaluation section, a strong argument is one that is relevant and important - not one that aligns with your views. An argument you disagree with can still be strong.
6. Rushing the passages. Spending an extra 10 seconds carefully reading a passage saves time on the questions that follow. Most errors come from misreading, not from faulty logic.
7. Not practising under timed conditions. Untimed practice builds understanding, but timed practice builds the speed and confidence you need on the day.

Law firms use a range of psychometric tests. Here is how the Watson Glaser compares to the other common assessments:

The Watson Glaser is generally considered more challenging than standard verbal reasoning tests because it requires you to apply multiple types of logical analysis rather than simply comprehending a passage. If you can perform well on the Watson Glaser, you will likely find other verbal assessments more straightforward.