Aptitude Tests for Trainee Solicitor Applications: The Watson-Glaser Gate and What Sits Behind It
If you are applying for a trainee solicitor position at a City firm, the Watson-Glaser Critical Thinking Appraisal is your single most important test. Magic Circle firms (Allen and Overy, Clifford Chance, Freshfields, Linklaters, Slaughter and May), Silver Circle firms, and every US firm with a London office use it as a hard gate. You do not progress to interview stage without clearing the cutoff. The legal sector has used Watson-Glaser longer than almost any other industry, and the scoring norms it applies have calcified into something close to a rite of passage.
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The trainee solicitor funnel in London is tightly standardized. Application form, Watson-Glaser (usually embedded in or triggered by the application), a second cognitive or situational judgment test depending on the firm, video interview, assessment centre, partner interview, offer. The Watson-Glaser sits early in the funnel for cost reasons: it is the cheapest high-signal filter the firm deploys.
Most firms set a Watson-Glaser cutoff at the 75 to 80 percent mark. Magic Circle firms set it at 80 percent, sometimes higher for open days and vacation schemes. The test is 30 minutes and 40 questions, split across five sub-skills: inference, recognition of assumptions, deduction, interpretation, and evaluation of arguments. Each sub-skill is scored separately, and at some firms each has its own minimum, not just the aggregate.
SHL-delivered reasoning tests appear at firms that use SHL's Universal Competency Framework, which includes Kingsley Napley, Hogan Lovells, and several Silver Circle firms. Where SHL appears, it usually runs in parallel with Watson-Glaser rather than replacing it. The firms want both a critical-thinking measure and a general cognitive measure.
The situational judgment tests that follow are less a gate and more a fit indicator. Firms use them to stack-rank passing candidates for limited interview slots. A mediocre SJT score with a stellar Watson-Glaser can still advance. The reverse almost never works.
Tests trainee solicitor candidates typically face
These are the two assessments most common in trainee solicitor recruitment. Watson-Glaser appears in every Magic Circle application; SHL shows up at many Silver Circle and US firms.
What trainee solicitor aptitude tests screen for
Watson-Glaser was built specifically to measure the cluster of skills a practicing lawyer uses daily. The five sub-skills map cleanly onto typical trainee tasks: reading a contract, analyzing case law, building arguments, spotting assumptions, and drawing careful deductions.
Inference from given facts
Given a short statement of facts, how reliably can you identify what can and cannot be inferred? The five-option scale (true, probably true, insufficient data, probably false, false) punishes over-claiming. Lawyers who over-infer in practice write briefs that get torn apart in court.
Recognition of unstated assumptions
Given a proposition, can you identify what must be true for it to hold? This is the bread-and-butter skill of deconstructing an opposing counsel's argument. Watson-Glaser tests it with pure-logic items and with dense business-style passages.
Deduction from premises
Classic syllogism-style items. Given premises, does the conclusion follow? Lawyers use this daily when reading statute and regulation. The test punishes bringing in outside knowledge.
Interpretation of evidence
Weighing conflicting or incomplete evidence. Similar to deduction but with less-clean premises. This section rewards careful reading and penalizes confident guessing.
Evaluation of arguments
Given a stated argument (usually on a business or policy topic), you label supplementary arguments as strong or weak. "Strong" means both relevant and important; "weak" is everything else. Most candidates over-classify arguments as strong because they sound persuasive without being substantive.
General cognitive ability (SHL layer)
At firms that also use SHL, the test adds numerical and inductive reasoning. Trainee solicitors use numerical reasoning less than lawyers realize, but City work on finance transactions and commercial disputes demands it.
A 14-day prep plan for trainee solicitor aptitude tests
Day 1: Take a diagnostic Watson-Glaser
Sit one full 30-minute mock cold. Score by section. You need to know where you bleed points. Most first-time candidates score 60 to 70 percent. The five sections will not be balanced. Your worst two are your focus for days 2 to 10.
Days 2 and 3: Inference and assumption recognition
These two sections trip up more candidates than any other. The fix is mechanical: never select "true" unless the passage says it. Never select "false" unless the passage explicitly contradicts it. "Insufficient data" is more often correct than candidates assume. Drill 20 items per day.
Days 4 and 5: Deduction
This is the most-improvable section with targeted prep. Syllogism patterns are small and recurring. Learn the standard forms (barbara, darii, celarent, ferio) and the common fallacies. 30 items per day.
Day 6: Interpretation
Weighted evidence items. Slow down on each passage. Read once for facts, once for conclusions. Drill 15 items.
Day 7: Evaluation of arguments
The smallest section. Learn the "strong versus weak" rubric: strong requires both relevance and importance. Drill 15 items in a single session.
Day 8: Second full Watson-Glaser mock
Sit a fresh 30-minute mock. Compare your section scores to day 1. Identify which sections improved and which did not. The ones that did not are your days 9 and 10 focus.
Days 9 and 10: Targeted cleanup
Drill exclusively your two weakest sections. 40 items per day on those. Everything else stays cold.
Days 11 and 12: SHL layer (if applicable)
Numerical reasoning and inductive reasoning, 20 items per day each. Only relevant if your firm's battery includes SHL.
Day 13: Final full-length mock
One more 30-minute Watson-Glaser mock. Aim for 80 percent or above. If you hit it, you are test-ready.
Day 14: Light review and rest
One 15-minute drill the morning of. Take the test when you are most alert. Deep reading fatigue is real and starts around item 30 for most candidates.
Sample questions oriented to trainee solicitor candidates
These represent the five Watson-Glaser sections in the style City firms use.
Inference
Passage: "A recent review of the Competition Authority found that 42 percent of contested merger cases in 2024 involved firms whose combined market share exceeded 35 percent." Proposed inference: "The Authority will block most future mergers involving firms with more than 35 percent combined market share." Options: true, probably true, insufficient data, probably false, false. The passage states one correlation; the proposed inference claims causation and future conduct. Insufficient data.
Assumption recognition
Proposition: "The new court sitting schedule will reduce case backlog." Proposed assumption: "The backlog is at least partly caused by insufficient court sitting time." Is this assumed? Yes, because if backlog were caused entirely by other factors, changing sitting schedules would not reduce it. The test rewards minimal necessary assumption, not maximum plausible assumption.
Deduction
Premises: "All barristers in this chambers have at least 10 years of practice. Some of them specialize in tax law." Conclusion: "Some tax specialists have less than 10 years of practice." Does the conclusion follow? No. The second premise limits to this chambers; the conclusion generalizes. Classic Watson-Glaser trap.
Evaluation of arguments
Question: "Should law firms require trainees to pass a critical thinking test?" Argument 1: "Yes, because critical thinking is essential to legal practice." Strong or weak? Weak. The argument is relevant but restates the premise rather than evidencing it. The Watson-Glaser scoring rewards spotting circular arguments.
Related reading
Trainee Solicitor hiring test FAQs
Watson-Glaser decides who interviews
Full-length Watson-Glaser practice with section-by-section scoring.
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