THE CONCEPT COLLECTION
Unpack the concept. Follow the reasoning. Then try it for yourself. A growing reading library for your JEE, NEET, SAT, GRE, GMAT and UPSC common-core preparation.
489 complete lessons currently available. Each lesson identifies its exact topics within the reviewed analytics or declared teaching framework. Selected past-exam questions and original practice are labeled separately. These notes support learning; they are not complete exam preparation or a claim of current-syllabus coverage.
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35 available lessons shown
GMAT · Counting, probability and statistical arithmetic
Original GMAT Problem Solving instruction: reason from constraints, calculate efficiently without a calculator, and check the requested quantity.
GMAT · Algebra and constraints
Original GMAT Problem Solving instruction: reason from constraints, calculate efficiently without a calculator, and check the requested quantity.
GMAT · Arithmetic and number properties
Original GMAT Problem Solving instruction: reason from constraints, calculate efficiently without a calculator, and check the requested quantity.
GMAT · Algebra and constraints
Original GMAT Problem Solving instruction: reason from constraints, calculate efficiently without a calculator, and check the requested quantity.
GMAT · Algebra and constraints
Original GMAT Problem Solving instruction: reason from constraints, calculate efficiently without a calculator, and check the requested quantity.
GMAT · Arithmetic and number properties
Original GMAT Problem Solving instruction: reason from constraints, calculate efficiently without a calculator, and check the requested quantity.
GMAT · Applied problem solving
Original GMAT Problem Solving instruction: reason from constraints, calculate efficiently without a calculator, and check the requested quantity.
GMAT · Ratios, proportions and percentages
Original GMAT Problem Solving instruction: reason from constraints, calculate efficiently without a calculator, and check the requested quantity.
GMAT · Arithmetic and number properties
Original GMAT Problem Solving instruction: reason from constraints, calculate efficiently without a calculator, and check the requested quantity.
GMAT · Applied problem solving
Original GMAT Problem Solving instruction: reason from constraints, calculate efficiently without a calculator, and check the requested quantity.
GMAT · Ratios, proportions and percentages
Original GMAT Problem Solving instruction: reason from constraints, calculate efficiently without a calculator, and check the requested quantity.
GMAT · Counting, probability and statistical arithmetic
Original GMAT Problem Solving instruction: reason from constraints, calculate efficiently without a calculator, and check the requested quantity.
GMAT · Applied problem solving
Original GMAT Problem Solving instruction: reason from constraints, calculate efficiently without a calculator, and check the requested quantity.
GRE · Data Analysis
Summarize a data set without confusing its typical value, total and variability.
GRE · Geometry
Translate radii, turns and shaded regions into exact lengths and areas.
GRE · Data Analysis
Choose whether order matters, track overlaps and translate counted outcomes into probabilities only when justified.
GRE · Data Analysis
Read a display’s variables, scale and reference group before calculating from a shared data set.
GRE · Algebra
Rewrite expressions without changing their value or silently enlarging their domain.
GRE · Arithmetic
Keep quantities exact, control signs, and recognize what decimal representations do and do not tell you.
GRE · Algebra
Connect formulas, coordinate positions and graph features while keeping domains and scales explicit.
GRE · Algebra
Treat inequalities as sets of allowed values and preserve their direction with care.
GRE · Arithmetic
Use structure, not large calculations, to reason about divisibility and possible integers.
GRE · Algebra
Translate relationships into one consistent variable and preserve equivalence while solving.
GRE · Geometry
Turn a crowded sketch into a small set of justified angle equations.
GRE · Arithmetic
Read signed positions and distances, solve absolute-value conditions and use reliable bounds.
GRE · Geometry
Connect shape definitions, angle totals and perpendicular heights to measurements that really follow.
GRE · Data Analysis
Read relative position and distribution shape without confusing rank, probability and a raw score.
GRE · Arithmetic
Track bases, signs and domains before simplifying powers, radicals and numerical patterns.
GRE · Data Analysis
Define the experiment and sample space before choosing addition, multiplication or a conditional denominator.
GRE · Algebra
Connect factors, roots, square structure and sign intervals without importing unnecessary calculus.
GRE · Arithmetic
Choose the reference quantity, align units and model rates before calculating.
GRE · Geometry
Track corresponding parts and scale each measurement by the right power.
GRE · Geometry
Build volume and exposed-surface calculations from dimensions, cross-sections and units.
GRE · Algebra
Find values that satisfy every condition, and recognize when a system fixes only part of the information.
GRE · Geometry
Build reliable side, angle and area models before reaching for a formula.
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