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GMAT 101
Focused GMAT prep in scrollable micro-lessons.
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Search lessonsData Sufficiency
Decide whether the statements force one unique answer without doing unnecessary solving.
Absolute Value Basics
Interpret absolute value as distance and solve equations by accounting for both directions.
Absolute Value Inequalities
Convert absolute-value inequalities into inside or outside intervals and use midpoint-radius form.
Coordinate Geometry
Use slope, line equations, midpoint, distance, and parallel or perpendicular relationships efficiently.
Permutations and Combinations
Choose between arrangement and selection counting by deciding whether order changes the outcome.
Relative Speed
Solve catch-up, meeting, and pass-then-separate motion problems by tracking how the gap changes.
Average Speed and Motion Variants
Handle average speed, equal-distance trips, currents, mixed units, and staggered starts without common setup errors.
Work and Machine Rates
Convert completion times into work rates and combine changing workers correctly.
Mixture Equations
Solve mixture problems by conserving total amount and the amount of pure ingredient.
Alligation
Use concentration differences to get a fast mixing ratio when one low and one high concentration create a target.
Probability
Use complements, multiplication, and inclusion-exclusion to model common probability questions.
Sets and Overlap
Compute unions, neither, exactly one, and the possible range of overlap between two sets.
Primes and Divisors
Recognize primes quickly and identify numbers with exactly three positive divisors.
Mental Math and Estimation
Reduce arithmetic time with structured transformations and estimate before over-calculating.
Fraction-Decimal Anchors
Recall common fraction-decimal-percent equivalents to compare values and estimate quickly.
Roots, Squares and Cubes
Use common roots and perfect powers as numerical anchors for comparison, simplification, and estimation.
Common Sums and Consecutive Integers
Use compact formulas for consecutive sums and exploit the average of consecutive integers.
Arithmetic Sequences
Find terms, count terms, and sum evenly spaced lists using the common difference.
Geometric and Alternating Sequences
Recognize constant-ratio sequences, compute geometric sums, and handle simple alternating patterns.
Backsolving and Picking Numbers
Use answer choices or clean test values to replace unnecessary algebra when the structure allows it.
DI Mindset and Core Math
Select the right information, check units and denominators, and use high-yield arithmetic before calculating.
Table Analysis
Evaluate table statements by targeting the needed columns, filters, and counterexamples.
Graphics Interpretation
Read axes, legends, scale, and stacked or dual-axis structure before extracting chart values.
Two-Part Analysis
Solve paired blanks efficiently by translating the conditions and plugging from the answer grid.
Multi-Source Reasoning
Retrieve only the relevant facts across tabs or sources without trying to memorize the entire information set.
Critical Reasoning Foundations
Break arguments into conclusion, evidence, and assumption before judging answer choices.
Strengthen and Weaken
Judge answer choices by whether they make an argument conclusion more or less likely through the underlying assumption.
Assumptions
Identify claims that must be true for an argument to work and confirm them with the negation test.
Resolve Paradox and Inference
Distinguish answers that reconcile surprising facts from answers that must follow from the evidence.
Reading Comprehension
Read passages for structure, purpose, attitude, and detail location rather than trying to memorize every fact.
Verbal Elimination
Remove answer choices that are too extreme, outside scope, logically reversed, or subtly distorted.
Test-Day Reset
Recover from confusion by rechecking the question, relevant information, units, and quickest reliable method.