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Notes Library
Concise, exam-accurate reference notes for the SAT and ACT. Each note explains what the test actually asks, then works through real-format questions with full explanations. Free to use, no sign-up.
Prerequisites
Foundational skills assumed by both the SAT and ACT. Start here if a topic below feels shaky — these use plain, high-school-style explanations.
Math foundations
- Fractions & operations
- Exponents & radicals
- Equation manipulation & literal equations
- Ratios, rates & proportions
- Percentages
- The coordinate plane & slope
Writing foundations
SAT
Organized by College Board's official domains and skills, so the structure matches what you'll see in Bluebook. Each note is calibrated against official practice tests.
Math
Algebra
- Linear equations in one variable
- Linear functions
- Linear equations in two variables
- Systems of two linear equations
- Linear inequalities
Advanced Math
Problem-Solving & Data Analysis
- Ratios, rates, proportions & units
- Percentages
- One-variable data: center & spread
- Two-variable data & scatterplots
- Probability & conditional probability
- Inference & margin of error
- Evaluating statistical claims
Geometry & Trigonometry
- Area & volume
- Lines, angles & triangles
- Right triangles & trigonometry
- Circles
Reading & Writing
- Reading & Writing notes — coming soon
ACT
Built to the ACT's reporting categories. Much of the math overlaps with the SAT and Prerequisites notes; the notes here focus on what's specific to the ACT.
Math
- ACT-specific math notes — coming soon
Reading
- ACT Reading notes — coming soon
English
- ACT English notes — coming soon