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GMAT CR MASTER PRETHINKING BOOK
The Real Exam-Brain System
This is NOT a theory book.
This is a:
PART 1 — THE CORE FOUNDATION
The Biggest CR Truth
Almost every CR question is testing this:
“Did the conclusion move beyond the evidence?”
Your job:
find the movement.
The Universal CR Engine
For EVERY argument:
Step 1 — Find Conclusion
Ask:
“What is the author trying to prove?”
Usually after:
Step 2 — Find Evidence
Ask:
“What facts are being used to support the conclusion?”
Step 3 — Compare Them
Ask ONLY:
“What changed?”
That is the master question.
PART 2 — THE 12 CORE GMAT MOVEMENT PATTERNS
These patterns appear repeatedly.
You must start seeing them automatically.
1. SMALL → LARGE
Pattern
Evidence from:
Internal Label
“Scaling assumption.”
What Changed?
Size/scope expanded.
Prethinking
Maybe:
Example
“Three schools improved scores after using software. Therefore the software should be adopted nationwide.”
Movement:
small → large
Prediction:
maybe national conditions differ.
2. SOME → ALL
Pattern
Evidence:
some people/items/groups
Conclusion:
everyone/everything/general rule
Internal Label
“Representativeness problem.”
Prethinking
Maybe:
Example
“Some customers preferred the redesign. Therefore consumers will prefer it.”
Movement:
some → all
3. PAST → FUTURE
Pattern
Past trend/event
→ future prediction
Internal Label
“Future may differ.”
Prethinking
Maybe:
Example
“Sales increased last year. Therefore sales will rise next year.”
Movement:
past → future
4. CORRELATION → CAUSATION
MOST IMPORTANT PATTERN
Pattern
Two things occur together.
Conclusion:
one caused the other.
Internal Labels
Prethinking Directions
Possible problems:
Example
“People who meditate report lower stress. Therefore meditation reduces stress.”
Possible attack:
Maybe low-stress people choose meditation.
5. EXPERT OPINION → FACT
Pattern
Experts/believers/supporters think X
→ therefore X is true
Internal Label
“Belief ≠ truth.”
Prethinking
Maybe:
Example
“Nutritionists recommend the diet. Therefore it is healthy.”
Possible issue:
recommendation alone does not prove effectiveness.
6. THEORY → REAL WORLD
Pattern
Something sounds good in principle
→ therefore it works practically
Internal Label
“Implementation gap.”
Prethinking
Maybe:
Example
“The transportation plan is efficient on paper. Therefore traffic congestion will decline.”
7. POSSIBILITY → CERTAINTY
Pattern
Could happen
→ will happen
Internal Label
“Overconfidence.”
Prethinking
Maybe:
Example
“The economy may improve. Therefore unemployment will definitely fall.”
8. ABSENCE OF EVIDENCE → EVIDENCE OF ABSENCE
Pattern
“No proof of X”
→ “X does not exist”
Internal Label
“Missing evidence problem.”
Example
“No studies show side effects. Therefore the drug is safe.”
Possible issue:
maybe studies insufficient.
9. SURVEY / SELF-REPORT PROBLEMS
Pattern
People reported/thought/claimed
→ conclusion about reality
Internal Label
“Reporting reliability.”
Prethinking
Maybe:
Example
“Most surveyed employees say they are productive at home. Therefore remote work increases productivity.”
10. COMPARISON / ANALOGY
Pattern
A similar thing worked
→ this thing will work
Internal Label
“Key difference?”
Prethinking
Maybe:
Example
“This marketing strategy worked for Company A, so it will work for Company B.”
11. NECESSARY vs SUFFICIENT
Pattern
Something required
→ treated as enough
OR
Something enough
→ treated as required
Internal Label
“Condition confusion.”
Example
“Exercise is necessary for health. John exercises. Therefore John is healthy.”
Missing:
exercise alone not sufficient.
12. PERCENTAGE vs ACTUAL NUMBER
Pattern
Percentages discussed
→ numerical conclusion
OR vice versa.
Internal Label
“Base number issue.”
Example
“Market share increased.”
Could still mean sales fell if market shrank.
PART 3 — QUESTION-TYPE PRETHINKING
Now we combine movement recognition with question type.
STRENGTHEN QUESTIONS
Your Job
Support the assumption.
Prethinking Formula
Ask:
“What must be true for this argument to work?”
Then strengthen THAT.
Typical Strengtheners
Example
Correlation:
Exercise linked to long life.
Strengthen:
People who exercise do not differ in major health habits.
Removes alternative explanation.
WEAKEN QUESTIONS
Your Job
Attack the assumption.
Prethinking Formula
Ask:
“Why might this jump fail?”
Typical Weakening Moves
ASSUMPTION QUESTIONS
MOST IMPORTANT QUESTION TYPE
Your Job
Find what MUST be true.
Golden Rule
The assumption is:
the bridge.
Prethinking Formula
Ask:
“What must the author believe for this argument to make sense?”
Example
small-scale success
→ large-scale success
Necessary assumption:
small-scale predicts large-scale.
Helpful Assumption Trick
Negate the idea mentally.
If argument collapses:
likely assumption.
INFERENCE QUESTIONS
Different from Argument Questions
No flaw hunting.
ONLY:
“What MUST be true?”
Your Mental Mode
Become conservative.
No imagination.
No outside logic.
No “probably.”
Internal Label
“Text prison.”
Prethinking
Ask:
“What is directly forced by the passage?”
RESOLVE / EXPLAIN PARADOX
Pattern
Two facts seem inconsistent.
Your job:
make both possible simultaneously.
Prethinking Formula
Ask:
“What missing fact allows BOTH facts to coexist?”
Example
Fact 1:
Restaurant quality improved.
Fact 2:
Customers decreased.
Possible resolution:
Prices increased sharply.
Now both fit.
BOLD FACE QUESTIONS
Your Job
Track roles.
Internal Labels
Prethinking
Do NOT solve content.
Only map function.
METHOD / ROLE QUESTIONS
Your Job
Identify sentence function.
Ask
PART 4 — THE MASTER PRETHINKING SYSTEM
The Full 10-Second System
When reading ANY CR argument:
Step 1
Find conclusion.
Step 2
Find evidence.
Step 3
Ask:
“What changed?”
Possible answers:
Step 4
Ask:
“Why might that jump fail?”
That creates prediction.
PART 5 — THE BIGGEST TRAPS
Trap 1 — Trying To Understand Everything
Wrong goal.
Instead:
track movement.
Trap 2 — Searching For Sophisticated Flaws
GMAT flaws are often simple.
Trap 3 — Topic Thinking Instead of Structure Thinking
Bad:
“papercrete... construction...”
Good:
“small → large”
Trap 4 — Overprethinking Before Options
Prediction should be LIGHT.
Not a full essay.
Trap 5 — Outside Knowledge
GMAT cares about:
argument structure,
not real-world truth.
PART 6 — ADVANCED HIGH-SCORER INSIGHT
What Elite CR Solvers Actually Do
They compress aggressively.
Long paragraph becomes:
They are not carrying full paragraph detail mentally.
The Real Secret of CR Speed
Fast CR is NOT:
fast reading.
It is:
fast compression.
What You Should Drill Daily
Take CR questions.
Do NOT solve first.
ONLY write:
Conclusion:
Evidence:
Movement:
Possible danger:
Do 30–50 questions this way.
Your brain will start auto-recognizing patterns.
Final CR Reality
CR is not mainly:
vocabulary,
deep reading,
or intelligence.
It is mainly:
recognizing predictable logical movements.
Once your brain starts auto-seeing:
The Real Exam-Brain System
This is NOT a theory book.
This is a:
- pattern recognition system
- low cognitive load framework
- “what changed?” machine
- understand every sentence deeply
- become philosophical
- sound intelligent
- identify conclusion
- identify evidence
- detect movement
- predict attack/support direction
PART 1 — THE CORE FOUNDATION
The Biggest CR Truth
Almost every CR question is testing this:
“Did the conclusion move beyond the evidence?”
Your job:
find the movement.
The Universal CR Engine
For EVERY argument:
Step 1 — Find Conclusion
Ask:
“What is the author trying to prove?”
Usually after:
- therefore
- thus
- hence
- so
- clearly
- probably
- should
Step 2 — Find Evidence
Ask:
“What facts are being used to support the conclusion?”
Step 3 — Compare Them
Ask ONLY:
“What changed?”
That is the master question.
PART 2 — THE 12 CORE GMAT MOVEMENT PATTERNS
These patterns appear repeatedly.
You must start seeing them automatically.
1. SMALL → LARGE
Pattern
Evidence from:
- small sample
- pilot program
- one city
- few users
- entire population
- national success
- large-scale effectiveness
Internal Label
“Scaling assumption.”
What Changed?
Size/scope expanded.
Prethinking
Maybe:
- small setting is not representative
- scaling changes conditions
- large systems behave differently
Example
“Three schools improved scores after using software. Therefore the software should be adopted nationwide.”
Movement:
small → large
Prediction:
maybe national conditions differ.
2. SOME → ALL
Pattern
Evidence:
some people/items/groups
Conclusion:
everyone/everything/general rule
Internal Label
“Representativeness problem.”
Prethinking
Maybe:
- sample is unusual
- evidence group differs from population
Example
“Some customers preferred the redesign. Therefore consumers will prefer it.”
Movement:
some → all
3. PAST → FUTURE
Pattern
Past trend/event
→ future prediction
Internal Label
“Future may differ.”
Prethinking
Maybe:
- conditions changed
- past trend not stable
- external factors differ now
Example
“Sales increased last year. Therefore sales will rise next year.”
Movement:
past → future
4. CORRELATION → CAUSATION
MOST IMPORTANT PATTERN
Pattern
Two things occur together.
Conclusion:
one caused the other.
Internal Labels
- “Alternative cause?”
- “Reverse causation?”
- “Coincidence?”
Prethinking Directions
Possible problems:
- Third factor causes both
- Reverse cause
- Coincidence
- Data distortion
Example
“People who meditate report lower stress. Therefore meditation reduces stress.”
Possible attack:
Maybe low-stress people choose meditation.
5. EXPERT OPINION → FACT
Pattern
Experts/believers/supporters think X
→ therefore X is true
Internal Label
“Belief ≠ truth.”
Prethinking
Maybe:
- experts biased
- incomplete expertise
- expertise in wrong domain
- disagreement exists
Example
“Nutritionists recommend the diet. Therefore it is healthy.”
Possible issue:
recommendation alone does not prove effectiveness.
6. THEORY → REAL WORLD
Pattern
Something sounds good in principle
→ therefore it works practically
Internal Label
“Implementation gap.”
Prethinking
Maybe:
- real-world obstacles
- costs
- human behavior
- logistics
Example
“The transportation plan is efficient on paper. Therefore traffic congestion will decline.”
7. POSSIBILITY → CERTAINTY
Pattern
Could happen
→ will happen
Internal Label
“Overconfidence.”
Prethinking
Maybe:
- only one possibility
- insufficient evidence for certainty
Example
“The economy may improve. Therefore unemployment will definitely fall.”
8. ABSENCE OF EVIDENCE → EVIDENCE OF ABSENCE
Pattern
“No proof of X”
→ “X does not exist”
Internal Label
“Missing evidence problem.”
Example
“No studies show side effects. Therefore the drug is safe.”
Possible issue:
maybe studies insufficient.
9. SURVEY / SELF-REPORT PROBLEMS
Pattern
People reported/thought/claimed
→ conclusion about reality
Internal Label
“Reporting reliability.”
Prethinking
Maybe:
- inaccurate reporting
- bias
- bad sampling
- social desirability
Example
“Most surveyed employees say they are productive at home. Therefore remote work increases productivity.”
10. COMPARISON / ANALOGY
Pattern
A similar thing worked
→ this thing will work
Internal Label
“Key difference?”
Prethinking
Maybe:
- important distinction ignored
Example
“This marketing strategy worked for Company A, so it will work for Company B.”
11. NECESSARY vs SUFFICIENT
Pattern
Something required
→ treated as enough
OR
Something enough
→ treated as required
Internal Label
“Condition confusion.”
Example
“Exercise is necessary for health. John exercises. Therefore John is healthy.”
Missing:
exercise alone not sufficient.
12. PERCENTAGE vs ACTUAL NUMBER
Pattern
Percentages discussed
→ numerical conclusion
OR vice versa.
Internal Label
“Base number issue.”
Example
“Market share increased.”
Could still mean sales fell if market shrank.
PART 3 — QUESTION-TYPE PRETHINKING
Now we combine movement recognition with question type.
STRENGTHEN QUESTIONS
Your Job
Support the assumption.
Prethinking Formula
Ask:
“What must be true for this argument to work?”
Then strengthen THAT.
Typical Strengtheners
- eliminate alternative causes
- show evidence representative
- connect evidence to conclusion
- confirm missing assumption
Example
Correlation:
Exercise linked to long life.
Strengthen:
People who exercise do not differ in major health habits.
Removes alternative explanation.
WEAKEN QUESTIONS
Your Job
Attack the assumption.
Prethinking Formula
Ask:
“Why might this jump fail?”
Typical Weakening Moves
- alternative cause
- counterexample
- nonrepresentative sample
- missing factor
- reversed causation
- scaling failure
ASSUMPTION QUESTIONS
MOST IMPORTANT QUESTION TYPE
Your Job
Find what MUST be true.
Golden Rule
The assumption is:
the bridge.
Prethinking Formula
Ask:
“What must the author believe for this argument to make sense?”
Example
small-scale success
→ large-scale success
Necessary assumption:
small-scale predicts large-scale.
Helpful Assumption Trick
Negate the idea mentally.
If argument collapses:
likely assumption.
INFERENCE QUESTIONS
Different from Argument Questions
No flaw hunting.
ONLY:
“What MUST be true?”
Your Mental Mode
Become conservative.
No imagination.
No outside logic.
No “probably.”
Internal Label
“Text prison.”
Prethinking
Ask:
“What is directly forced by the passage?”
RESOLVE / EXPLAIN PARADOX
Pattern
Two facts seem inconsistent.
Your job:
make both possible simultaneously.
Prethinking Formula
Ask:
“What missing fact allows BOTH facts to coexist?”
Example
Fact 1:
Restaurant quality improved.
Fact 2:
Customers decreased.
Possible resolution:
Prices increased sharply.
Now both fit.
BOLD FACE QUESTIONS
Your Job
Track roles.
Internal Labels
- conclusion
- evidence
- objection
- counterevidence
- concession
Prethinking
Do NOT solve content.
Only map function.
METHOD / ROLE QUESTIONS
Your Job
Identify sentence function.
Ask
- Is this evidence?
- hypothesis?
- conclusion?
- concession?
- background?
PART 4 — THE MASTER PRETHINKING SYSTEM
The Full 10-Second System
When reading ANY CR argument:
Step 1
Find conclusion.
Step 2
Find evidence.
Step 3
Ask:
“What changed?”
Possible answers:
- small → large
- correlation → cause
- expert → truth
- past → future
- some → all
Step 4
Ask:
“Why might that jump fail?”
That creates prediction.
PART 5 — THE BIGGEST TRAPS
Trap 1 — Trying To Understand Everything
Wrong goal.
Instead:
track movement.
Trap 2 — Searching For Sophisticated Flaws
GMAT flaws are often simple.
Trap 3 — Topic Thinking Instead of Structure Thinking
Bad:
“papercrete... construction...”
Good:
“small → large”
Trap 4 — Overprethinking Before Options
Prediction should be LIGHT.
Not a full essay.
Trap 5 — Outside Knowledge
GMAT cares about:
argument structure,
not real-world truth.
PART 6 — ADVANCED HIGH-SCORER INSIGHT
What Elite CR Solvers Actually Do
They compress aggressively.
Long paragraph becomes:
- correlation
- scale jump
- future prediction
- expert opinion
They are not carrying full paragraph detail mentally.
The Real Secret of CR Speed
Fast CR is NOT:
fast reading.
It is:
fast compression.
What You Should Drill Daily
Take CR questions.
Do NOT solve first.
ONLY write:
Conclusion:
Evidence:
Movement:
Possible danger:
Do 30–50 questions this way.
Your brain will start auto-recognizing patterns.
Final CR Reality
CR is not mainly:
vocabulary,
deep reading,
or intelligence.
It is mainly:
recognizing predictable logical movements.
Once your brain starts auto-seeing:
- small → large
- some → all
- correlation → cause
- past → future
Moderators:
