Watson Glaser Test Guide: Structure, Scoring & Preparation (2026)

The Watson Glaser test, or, in full, the Watson Glaser Critical Thinking Appraisal (WGCTA), evaluates critical thinking and logical reasoning skills. It measures how effectively candidates can interpret information, identify assumptions, evaluate arguments, and draw sound conclusions.

The test is structured around five sections, each assessing a distinct skill:

• Inference: Drawing conclusions from observed or assumed facts
• Assumptions: Identifying whether an assumption is being made in the statement
• Deduction: Assessing whether a conclusion follows with certainty from the given premises (there's no "probably" in this section)
• Interpretation: Judging whether a conclusion can be drawn beyond reasonable doubt from the given information
• Evaluation of Arguments: Assessing whether an argument is strong or weak based on its relevance and importance to the question

The sections vary in format and difficulty, but all reward strict logical reasoning over prior knowledge or gut instinct.

The best way to understand the Watson Glaser test is to work through real questions.

Below are two examples - one from Inference, one from Deduction - with the full explanation for each, so you can see exactly how the correct answer is reached and where the traps are.

For full-length, timed practice across all five sections, try our free Watson Glaser practice test, or work through the complete Watson Glaser PrepPack for expert walkthroughs of every question type.

Our PrepPack offers one-of-a-kind personalised learning: An initial assessment pinpoints your starting level, then adaptive programming adjusts difficulty as you work through practice sessions and shifts into more detailed explanations the moment a knowledge gap appears, helping you master every question type before test day.

Watson Glaser doesn't test what you know. It tests whether you can be trusted to reason carefully when the information is incomplete and the stakes are high. That's exactly the skill law firms want to see before they hand someone a live case file.

A few things in particular catch candidates out:

• Outside knowledge: If something is true in the real world but isn't stated in the passage, the test wants you to ignore it. Using it anyway is the most common way strong candidates lose marks.
• Instinct over evidence: A conclusion can feel obviously right and still be the wrong answer simply because it isn't strictly supported by what's written.
• Time pressure: With under a minute per question on average, the test also checks whether your reasoning holds up when you can't deliberate at length.

None of this is really about intelligence. It's about discipline, which is why methodical practice tends to move scores more than general aptitude does.

For a closer look at how each section tests this differently, see our guide on what the Watson Glaser test measures.

The Watson-Glaser test is typically scored based on the number of correct answers out of 40. 

The Watson Glaser aptitude test is generally used by law firms and government legal services. You'll most often encounter it in the following roles:

• Trainee Solicitors & Solicitors
• Graduate Trainees
• Lawyers
• Vacation Scheme
• Public Health Registrars
• Analysts

Critical thinking is central to all of these roles, which is why employers rely on the Watson Glaser to assess it directly.

Here's are some law firms that have been known to use the Watson Glaser test as part of their recruitment process:

For different law firm pre-employment tests, check out our page on the Suited Assessment or visit our tailored preparation pages for Clifford Chance, Linklaters, and other critical thinking tests. 

Methodical preparation matters here. The Watson Glaser rewards discipline more than raw intelligence, and most candidates who underperform do so because they answer instinctively rather than mechanically.

Here's what makes the biggest difference:

• Practise under real time pressure: The full test is 40 questions in 30 minutes, giving you just under a minute per question on average. Timed simulations matter more than untimed practice, since the time constraint often trips people up.
• Strengthen the underlying skill, not just the questions: Read opinion pieces, editorials, or case reports and practise separating what's actually stated from what's implied. This is the skill Assumptions and Interpretation test most directly, and it's hard to build under exam pressure if you haven't done it beforehand.
• Rely only on the text in front of you: No outside knowledge, no gut feel - a conclusion can feel obviously right and still be the wrong answer if the passage doesn't actually support it.
• Read the exact wording, not the gist: Words like some, all, or marked advantage often decide the correct answer on their own.
• Manage your time across all 40 questions, not question by question: A tough question is worth the same as an easy one, so don't let it cost you three others.
• Track which of the five sections you consistently get wrong, and weight your remaining practice toward it: Our adaptive Watson Glaser PrepPack does this automatically if you'd rather not track it by hand.

For more exam-day tactics and a closer look at what tends to catch candidates out, see our full guide on Watson Glaser test tips.

Knowing what to work on is one thing, but sticking to it without a plan is where most self-study falls apart. A programme that adapts as you improve and paces itself to your actual test date - like our Watson Glaser PrepPack - solves exactly that.