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- Math
- Reading
- Grammar
The ultimate guide to SAT mastery.
- 10 full-length practice tests in the Bluebook Simulator
- A Desmos simulator that checks each step you type
- 122 lessons on every skill the SAT tests
One payment, no subscription. The price rises to $149 at launch on October 25.
A tour of the library
Solve each question one small step at a time.
- Type each equation yourself, with your keyboard.
- The simulator checks each step and explains what the graph shows.
- Try the first lesson here: graph both sides of an equation and find where they cross.
It covers four skill groups: “Read a graph”, “Work with tables”, “Type with confidence”, and “Understand functions”.
Solve
What value of is the solution to the equation below?
1
Expression 1
2
Expression 2
Enter an equation to see its graph here
Step 1 · Enter
Graph the left side
Enter in input box 1. The resulting graph shows the value of the equation’s left side for each x.
Type it
- y=2x+5
Visual explanations
Every new idea comes with a drawing.
- Hover over or tap a key term in any lesson.
- A card opens with a plain definition and a drawing of the idea.
- Worked examples mark the exact words or numbers that change.
- Grammar
independent clause
A group of words with a subject and a verb that makes sense by itself as a complete sentence.
Example"The bus was late" can stand alone.
- Math
slope
How steep a line is: how much y changes each time x goes up by 1. It is the m in y = mx + b.
Exampley = 3x + 2 rises 3 for every 1 step right.
- Reading
central idea
The main point of a whole passage: the one idea that everything else in it supports.
Bluebook Simulator
After each test, see what went wrong and how to fix it.
- It works like Bluebook, the app you take the digital SAT in, for full tests and every lesson’s practice.
- Nothing extra shows during a test. The guides, the heatmap, and your results come after you submit.
- Full practice tests run here with test‑day timing: 2 hr 14 min, plus a 10‑minute break.
After you submit
4 free questions in 7 minutes
Guided review. In review, “Guide me through this” breaks any practice-test question into small questions you answer, marked on its own words.
10 Full-length practice tests
- Reading and Writing
- Module 127 questions, 32 min
- Module 227 questions, 32 min
- 10-minute break
- Math
- Module 122 questions, 35 min
- Module 222 questions, 35 min
Every skill mapped
All 122 lessons, grouped by subject and skill.
- 59lessonsSAT MathFor when you read a problem and don’t know where to start.Desmos MasteryAlgebra FoundationsProblem SolvingLinear RelationshipsFunctions+5 moreSee the SAT Math lessons
- 39lessonsSAT ReadingFor when two answer choices both sound right.ComprehensionVocabularyArgument & Critical ReadingText StructureRhetorical Analysis+4 moreSee the SAT Reading lessons
- 24lessonsSAT GrammarFor when comma and semicolon questions feel like a coin flip.Sentence StructurePunctuationTransitionsAgreementVerbs+2 moreSee the SAT Grammar lessons
XP and the weekly leaderboard
Right answers and good habits earn XP.
- Every lesson question gives XP the moment you get it right.
- Practice tests give XP after you finish, for right answers and habits like leaving nothing blank.
- The weekly leaderboard shows each student only as a first initial and a picture they choose.
Free lessons
Try 16 full lessons free before you decide.
SAT Math6 free
SAT Reading4 free
SAT Grammar6 free
Hello, I’m
Tom Meli
SAT instructor
I’ve spent twenty years learning how to explain hard ideas so they stick.
I’ve taught since 2006 and have focused on the SAT since 2015. Along the way, I’ve learned which explanations and examples help a student understand a difficult idea well enough to use it on a question they haven’t seen.
I built Deep Test Prep to put those lessons in one place. The online library covers SAT Math, Reading, and Grammar with step-by-step walkthroughs, drawn explanations, and practice that checks your thinking as you go.
When a question trips you up, you can open the lesson for that skill or work through a subject one topic at a time.
P.S. I’m also working to change how students learn in high school and beyond. You can see what I’m building next at Play for Mastery.
Deep Test Prep Online Library
Preorder now. Start studying at launch.
- 10 full-length practice tests
- A step-by-step guide for every practice test question
- The Desmos simulator, which checks every step you type
- 122 lessons across math, reading, and grammar
- The Bluebook Simulator, with test-day timing and tools
- A drawing and a plain definition for every key term
Early bird preorder
$97
One payment. No subscription.
Access opens at launch on October 25, when the price rises to $149.
See preorder detailsAlready have access? Sign in