Master the Digital SAT, one skill at a time.
- No paywalls
- 10 Reading & Writing skills
- 19 Math skills
- Desmos built in
How SATOpen works
A clear path from your first question to test day.
- Step 1
Create your free account
Sign up with Google or email, accept the User License Agreement, and set the SAT score you are aiming for.
- Step 2
Take the 29-skill diagnostic
Answer one question for each of the 10 Reading & Writing and 19 Math skills to set your starting point.
- Step 3
Learn and practice by skill
Read the lesson for a skill, practice on your mastery path, and get a five-layer explanation after every answer.
- Step 4
Prove it on mock tests
Take full-screen mock tests with Desmos, a reference sheet, highlighting and answer elimination.
What you will master
29 skills. Nothing extra, nothing missing.
See every skill explained, with what it asks you to do and its question types.
Reading & Writing
10 skillsCraft and Structure
- Words in Context
- Text Structure and Purpose
- Cross-Text Connections
Information and Ideas
- Central Ideas and Details
- Command of Evidence
- Inferences
Standard English Conventions
- Boundaries
- Form, Structure, and Sense
Expression of Ideas
- Transitions
- Rhetorical Synthesis
Math
19 skillsAlgebra
- Linear Equations in One Variable
- Linear Functions
- Linear Equations in Two Variables
- Systems of Two Linear Equations in Two Variables
- Linear Inequalities in One or Two Variables
Advanced Math
- Equivalent Expressions
- Nonlinear Equations in One Variable and Systems of Equations in Two Variables
- Nonlinear Functions
Problem-Solving and Data Analysis
- Ratios, Rates, Proportional Relationships, and Units
- Percentages
- One-Variable Data: Distributions and Measures of Center and Spread
- Two-Variable Data: Models and Scatterplots
- Probability and Conditional Probability
- Inference from Sample Statistics and Margin of Error
- Evaluating Statistical Claims: Observational Studies and Experiments
Geometry and Trigonometry
- Area and Volume
- Lines, Angles, and Triangles
- Right Triangles and Trigonometry
- Circles
Five-layer feedback
Every answer teaches you something.
Practice gives immediate feedback — no countdown timer — and an explanation in five layers, so you understand the idea, the method, the traps and the fastest route.
Practice With 5-Layer FeedbackLayer 1 · Simple explanation
The key idea in a few sentences, right after you answer.
Layer 2 · Step by step
Every step of the solution, in order.
Layer 3 · Why it works
Why the method works, and why tempting wrong answers are wrong — including the one you picked.
Layer 4 · Fast method
A quicker test-day approach, a ninja tip, and a Desmos method for Math.
Layer 5 · Vocabulary
Words from that question, with their definitions, that you can save to your own list.
Vocabulary
A clean card for every word.
Move through the SATOpen Vocabulary Bank with Back and Next, and save any word — from the bank or from a question explanation — to your own Tricky Words list.
Every card shows two things
- • The word
- • Its definition
Mock tests
Full-screen, focused exam mode.
When a mock test starts, everything else disappears. You get the tools you need and nothing else.
- Desmos graphing calculator in Math
- Math reference sheet
- Yellow and blue highlighting in Reading & Writing
- Answer elimination in both sections
Results show your accuracy by section and a clearly labeled SATOpen Estimated Score — never presented as an official score.
Free for every student.
No trials, no locked lessons, no ads. Lessons, practice and mock tests are free for every student.
Questions, answered.
Start with your diagnostic today.
It takes 29 questions to see exactly where you stand in every skill.
Start Learning Free