LSAT Study Guide
Your area-by-area roadmap
The LSAT rewards a small set of repeatable reasoning skills far more than memorized content. This guide breaks the test into its two scored section types. Learn to recognize each question type, drill the reasoning it wants, then reinforce with flashcards and full-length timed tests.
Logical Reasoning
~50% of the scored questions (two of three sections)
Short arguments followed by a single question. Success comes from reading for structure — the conclusion, the evidence, and the assumption bridging them — rather than the topic.
Read for argument structure
- Find the conclusion first, then the premises that support it — indicator words like 'therefore', 'thus', and 'because' locate them.
- State the gap: the unstated assumption the argument needs to be valid.
- Distinguish an argument (a conclusion backed by reasons) from a mere set of facts.
- Watch for conditional logic and its contrapositive; a statement and its contrapositive are equivalent.
Know the question families
- Assumption family: Necessary/Sufficient Assumption, Strengthen, Weaken, Flaw, and Evaluate.
- Inference family: Must Be True, Most Strongly Supported, and Cannot Be True.
- Descriptive family: Method of Reasoning, Role of a Statement (Bolded), Point at Issue, and Parallel Reasoning.
- Principle and Paradox questions, which reward matching a rule or reconciling two facts.
Common flaws to recognize
- Correlation treated as causation; alternative causes ignored.
- Sampling and survey problems: unrepresentative or biased samples.
- Equivocation, circular reasoning, and confusing necessary with sufficient conditions.
- Ad hominem, appeals to authority, and straw-man distortions of a position.
High-yield takeaways
- Pre-phrase the answer before reading the choices — commit to what the argument needs.
- For Strengthen/Weaken, the credited answer affects the link between evidence and conclusion, not an isolated fact.
- Necessary vs. Sufficient Assumption is the single most tested distinction — the negation test confirms a necessary assumption.
Reading Comprehension
~33% of the scored questions (one section, four passages)
Dense passages — including a paired comparative set — each followed by a group of questions. The skill is mapping a passage's structure and viewpoints quickly, then returning to the text for support.
Map the passage, don't memorize it
- Track the main point, the author's attitude, and each paragraph's function.
- Note where different viewpoints are introduced and how the author evaluates them.
- In comparative (paired) passages, chart where the two authors agree and disagree.
Answer from the text
- Main Point and Primary Purpose questions test the whole passage — favor the choice that covers it without overreaching.
- Detail and 'according to the passage' questions have textual support you can point to.
- Inference questions ask what must follow from the passage, not what is merely plausible.
- Tone/attitude questions hinge on the author's word choice.
High-yield takeaways
- Extreme wording ('all', 'never', 'impossible') is usually wrong unless the passage is equally strong.
- The best Main Point answer reflects the author's own conclusion, not a view the author reports or rejects.
- For every answer, locate the specific lines that justify it before committing.
Ready to practice?
Reinforce what you reviewed with flashcards or a timed test.