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Logical Reasoning

Logical Reasoning practice

Spotting the flaw
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The rule “if it rains, the game is off” is true. The game is off. Why can’t you conclude it rained?
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LSAT/GMAT-style argument reasoning practice
Logical reasoning practice in the LSAT Logical Reasoning and GMAT Critical Reasoning style: a short argument followed by a task — strengthen or weaken it, find the necessary or sufficient assumption, identify the flaw, infer what must be true, match parallel reasoning, describe the method, resolve a paradox, evaluate it, find the conclusion, or apply a principle. The single best way to build test-day argument skills. Aligned to the LSAT/GMAT style — not official exam material. Distinct from Critical Thinking (everyday fallacies and biases).
• Meets you at your level — never too easy, never too hard.
• Adapts every question to how you’re doing.
• Tracks your level over time. Skill practice, not a test.

New here? Read the Logical Reasoning guide

A free 18-minute primer — the mental model, the mistakes beginners make, and what to practice first.

Curriculum

151 concepts across 27 chapters, from foundations through advanced practice — each one a concept the adaptive question bank can teach and test.

A. What an argument is

7

B. Conclusion, premises, and argument structure

7

C. Validity and soundness

7

D. Conditional statements

7

E. Necessary and sufficient conditions

4

F. Categorical logic and quantifiers

7

G. Valid forms and formal fallacies

7

H. Induction and inductive strength

6

I. Statistical and sampling reasoning

4

J. Causal reasoning

7

K. Analogical reasoning

5

L. Abduction and explanation

6

M. Fallacies of relevance

8

N. Fallacies of presumption

8

O. Fallacies of ambiguity and language

6

P. The task taxonomy

5

Q. Assumption questions

6

R. Sufficient assumption and justify

1

S. Strengthen questions

3

T. Weaken questions

4

U. Flaw questions

7

V. Inference and must-be-true

7

W. Principle questions

5

X. Parallel reasoning

3

Y. Method, role, and main point

3

Z. Paradox, evaluate, and disagreement

7

AA. Formal deduction puzzles

4
View the full curriculum →
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Logical Reasoning on exams

Logical Reasoning is one of the skills tested on these exams. Each prep page lays out what the real test covers and where this skill fits.
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