Free
$0no card needed
- The Daily, every day
- 36 practice questions a day, each with an explanation: 12 easy, 12 medium, 12 hard
- Full-length Test A and Challenge Test 1
- All 1,023 vocabulary words: browse, flashcards and quiz
Digital SAT practice
Reach your peak.
A quick run every day, an explanation for every question, and full-length tests on official timing.
Free, no card. You also get 36 practice questions a day: 12 easy, 12 medium and 12 hard.
The DailySTEP 1
- Three hearts. A miss costs one.
- Streaks pay. ×2 from three in a row, ×3 from six.
- Your longest streak. Beat it tomorrow.
Full-length tests
The real test, rehearsed.
98 questions across four modules, in the digital SAT’s order and on its timing, with a highlighter, a question map and a timer you can see.
How it works
One run a day. One skill at a time.
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1
Play the Daily.
A quick run with three hearts. String right answers together and the questions get harder and the points multiply.
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2
Miss one, learn why.
Every question is tagged by domain and skill, and every answer comes with an explanation.
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3
Drill that skill.
Practice any single skill at any difficulty, or just the questions you got wrong.
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4
Beat your best.
Come back tomorrow and climb. Progress shows your accuracy and your strongest skills.
Built around the real SAT blueprint.
Every question is tagged by section, domain, skill and difficulty, so you can practice exactly what you need. Full tests run like test day: two Reading & Writing modules, a break, then two Math modules.
Free daily practice
12 easy, 12 medium and 12 hard questions free every day, each with a full explanation. Filter by section, domain, skill and difficulty. Resets at midnight.
Real SAT timing
Take any test on official timing, extended 1.5× time, or untimed to focus purely on accuracy.
Adaptive full-length tests
Four modules in official order. The second module of each section adapts to how you did on the first.
Vocabulary
1,023 essential SAT words. Browse the list, flip flashcards, or quiz yourself.
Your progress
Accuracy across daily practice and full tests, your strongest skills, and the ones that need the most help.
Games
PEAK Survivor, Hole and Peak Defense: three games powered by SAT practice questions.
Explanations
Every answer, explained.
Not just the right letter: how to get there, and why the tempting answer is wrong.
MathProblem-Solving and Data AnalysisHard
A store raises the price of a jacket by 20%. Later, it lowers the new price by 20%. The final price is what percent of the original price?
A80%
B96%Correct
C100%The trap
D104%
Check with $100: $100→then$120→then$96
Turn each change into a multiplier.
Up 20% means × 1.20. Down 20% means × 0.80.
Apply them in order.
1.20 × 0.80 = 0.96
Read the answer.
The final price is 96% of the original. That’s B.
Why not 100%?
The 20% cut is taken from the higher price, so it removes more than the 20% increase added.
Test day
What test day looks like.
Every Peakscor full test follows this order. In the standard tests, the second module of each section adapts to how you did on the first.
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Reading & Writing · Module 1
27 questions32 min
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Reading & Writing · Module 2
27 questions32 min
Adapts to how you did on Module 1. -
Break
10 min
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Math · Module 1
22 questions35 min
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Math · Module 2
22 questions35 min
Adapts to how you did on Module 1.
98 questions · 2 hr 14 min of testing, plus the break
Peakscor by the numbers
- 36free practice questions every day
- 98questions in every full-length test
- 1,023SAT vocabulary words
- 1.5×extended-time option on every test
Free vs Pro
Free every day. Pro when you’re serious.
The free plan is the real thing, not a trial. Pro removes the limits.
Pro Checkout opens soon
$20a month, or $180 a year
- Everything in Free
- Unlimited practice, no daily limit
- Every full-length test and Challenge test
Prices in US dollars. Pro checkout isn’t open yet, so nothing can be bought today.
FAQ
Questions, answered.
The Daily, plus 36 practice questions every day: 12 easy, 12 medium and 12 hard, each with a full explanation. Full-length Test A, Challenge Test 1 and all 1,023 vocabulary words are free too. No card needed.
Unlimited practice with no daily limit, plus every full-length test and Challenge test. Pro is $20 a month or $180 a year. Checkout isn’t open yet, so nothing can be bought today.
98 questions across four modules, in the digital SAT’s order: Reading & Writing Module 1 and Module 2 (27 questions each), a 10-minute break, then Math Module 1 and Module 2 (22 questions each). On official timing that’s 2 hr 14 min of testing. You get estimated section scores and a total at the end.
Yes. In the standard full-length tests, Module 2 of each section is the harder version if you get 60% or more of Module 1 right, and the easier version if you don’t. Challenge tests use the hardest material throughout.
Official timing, extended 1.5× time, or untimed, on every test, including the free ones. Extended time allows 48 minutes for each Reading & Writing module and about 52 for each Math module. Untimed removes the clock so you can focus on accuracy.
A quick run with three hearts. Each right answer builds your streak: the questions get harder as it grows, and your points multiply (×2 from three in a row, ×3 from six). A miss costs a heart and drops you back to easy. Best is your longest streak.
Every day at midnight. You get a fresh 12 easy, 12 medium and 12 hard.
No. Peakscor is an independent SAT practice tool, not affiliated with the College Board. Scores shown are estimates.
Your next point starts today.
Free, no card.
Linear equations in one variable · Lesson 1
No solution or infinitely many solutions
Most linear equations have exactly one solution. Two special kinds don't, and the SAT asks about them often.
Simplify each side completely first: clear fractions, distribute and combine like terms. You want each side in the form (number) + (number), such as . Then compare the two sides.
**Different -coefficients: exactly one solution. Same -coefficient, different constants**: no solution. Subtracting from both sides of leaves , which is false no matter what is. **Same -coefficient and same constant**: infinitely many solutions. The two sides are the same expression, so every value of works, and subtracting leaves a statement that is always true, such as .
When the equation contains a constant such as , work backward. For no solution, set the -coefficients equal to each other and make sure the constants are different. For infinitely many solutions, set the -coefficients equal and the constants equal.
| After simplifying | Example | Number of solutions |
|---|---|---|
| Different -coefficients | Exactly one () | |
| Same -coefficient, different constants | None | |
| Same -coefficient, same constant | Infinitely many |
Worked example Easy
How many solutions does the given equation have?
- ZeroAnswer
- Exactly one
- Exactly two
- Infinitely many
How to solve it
- Distribute on the left: .
- Both sides have the same -coefficient, 6, but different constants, and 7.
- Subtracting from both sides leaves , which is never true. The equation has zero solutions.
Why each choice is right or wrong
- A. Correct. After distributing, . The -terms cancel and leave , which is false for every .
- B. Incorrect. An equation has exactly one solution when the -coefficients differ after simplifying. Here both are 6.
- C. Incorrect. A linear equation can't have exactly two solutions. It has zero, one or infinitely many.
- D. Incorrect. Infinitely many solutions would need the constants to match as well, but .
Worked example Medium
In the given equation, is a constant. The equation has no solution. What is the value of ?
- Answer
How to solve it
- Distribute: . Group the -terms: .
- No solution needs equal -coefficients: , so .
- Check the constants: and 8 are different. With the equation is , which has no solution.
Why each choice is right or wrong
- A. Correct. The left side's -coefficient is . Setting gives , and the constants and 8 differ, so there is no solution.
- B. Incorrect. This is a sign slip in . With , the equation is , which has exactly one solution, .
- C. Incorrect. This sets equal to the right side's coefficient and forgets the already on the left. With , the equation is , which has exactly one solution.
- D. Incorrect. This matches to a constant. Because multiplies , it changes the -coefficient, and that coefficient must equal 3. With , the equation has exactly one solution.
Your progress
How you’re doing across daily practice and full-length tests.
Practice
Choose a section, then practice a whole domain or drill a single skill.
Full-length tests
Each test mirrors the digital SAT: 98 questions across four modules, 2 hr 14 min on official timing.
Challenge Tests Hardest of the hardest
Same 98-question format, but every question is drawn from the toughest SAT material: Challenging-tier math throughout and the hardest reading.
Vocab
Study the classic SAT vocabulary list. Browse, flip flashcards, or quiz yourself.
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