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
Plans
Free every day. Pro when you’re serious.
The free plan is the real thing, not a trial. Pro removes the limits. Peak adds the full course and a plan to test day.
Pro
$20a month, or $200 a year
- Everything in Free
- Unlimited practice, no daily limit
- Every full-length test and Challenge test
Peak
$29a month, or $280 a year
- Everything in Pro
- The full Learn course: every lesson and mastery quiz
- Peak Plan, day by day to test day
Prices in US dollars. Cancel anytime.
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.
Pro is $20 a month or $200 a year: unlimited practice with no daily limit, plus every full-length test and Challenge test. Peak is $29 a month or $280 a year: everything in Pro, plus the full Learn course and Peak Plan. Cancel anytime from your account.
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.
Evaluating statistical claims · Lesson 2
Random samples and the population
Most studies can't measure everyone they care about. The population is the whole group a question is about. The sample is the part of it that is actually studied.
A random sample is chosen by a chance process from the population, for example by drawing names from a complete list so that every member has the same chance of being picked. Because chance does the picking, a random sample tends to resemble its population, so its results can be generalized to that population.
The key limit: a result generalizes only to the population the sample was drawn from. A random sample of a city's library-card holders tells you about library-card holders in that city. It doesn't tell you about every resident of the city, or about card holders anywhere else.
When the sample is random, you can scale its result up to the population. If 18 households in a random sample of 60 households from a town own a boat, that is , or 30%, of the sample. If the town has 7,000 households, a good estimate is households with a boat. It is an estimate, not an exact count: another random sample would give a slightly different number.
If the sample wasn't random (volunteers, or whoever was easiest to reach), its result describes only the people in the sample. Lesson 3 shows why.
Worked example Easy
A county election office used a random number generator to select 350 people from its complete list of registered voters. Of the people selected, 217 said they support building a new public pool.
Which statement is best supported by the survey?
- The result describes only the 350 voters surveyed, since the rest weren't asked.
- Most residents of the state likely support building a new public pool.
- Exactly 62% of the county's registered voters support building a new public pool.
- Most registered voters in the county likely support building a new public pool.Answer
How to solve it
- The sample was chosen at random from the complete list of the county's registered voters, so that is the population the result generalizes to.
- In the sample, , or 62%, support the pool. That is a majority.
- So the best estimate is that a majority of the county's registered voters support the pool. It is an estimate, so a statement with likely fits; one with exactly doesn't.
Why each choice is right or wrong
- A. Incorrect. Because the 350 voters were chosen at random from the whole list, the result can be generalized to all the county's registered voters. That is the point of a random sample.
- B. Incorrect. The sample came only from one county's registered voters. It says nothing reliable about residents of the rest of the state.
- C. Incorrect. 62% is right for the sample, but a sample gives an estimate for the population, not an exact value. Another random sample would give a slightly different percent.
- D. Correct. The voters were randomly selected from the full list of the county's registered voters, and 62% of them support the pool, so a majority of that population likely does too.
Worked example Medium
To learn about first-year students at Ridgeway University, a researcher randomly selected 150 first-year students from the university's enrollment list. Of the students selected, 44% said they work at a part-time job during the school year.
To which group can the result most appropriately be generalized?
- All students at Ridgeway University
- All first-year students at Ridgeway UniversityAnswer
- All first-year college students in the country
- Only the 150 students who were selected
How to solve it
- Find the list the sample was drawn from: first-year students at Ridgeway University.
- The selection was random, so the result can be generalized beyond the 150 students, but only to that population.
- Students in other years, and first-year students at other colleges, had no chance of being selected, so the result doesn't apply to them.
Why each choice is right or wrong
- A. Incorrect. Only first-year students could be selected. Students in later years may be more or less likely to work, so the result doesn't apply to them.
- B. Correct. The 150 students were randomly selected from Ridgeway's first-year students, so the result generalizes to that group.
- C. Incorrect. Students at other colleges had no chance of being in the sample, so the result can't be applied to them.
- D. Incorrect. This claims too little. Because the selection was random, the result can be generalized to all of Ridgeway's first-year students, not just those selected.
Trap Generalizing to a bigger group
Wrong choices often swap in a larger or different group than the one sampled. Before you pick, check that the group named in the choice is the same group as the list or place the sample was drawn from, even when the choice words it differently (the county's registered voters for a sample from the county's list of registered voters). A sample from one list says nothing reliable about people who weren't on it.
Trap Treating an estimate as exact
A random sample gives an estimate for the population. A choice that says the population's value is exactly the sample's value claims too much. Words such as about, likely or best estimate are the honest way to state a sample result.
Desmos When Desmos isn’t faster
There is nothing to graph here, and deciding which population a result applies to is a reading question.
When a question asks you to scale a sample result up to a population, you can use Desmos as a calculator: type an expression such as 7000*18/60 on an expression line and Desmos shows its value. For clean numbers, working it out by hand is just as fast; use Desmos when the arithmetic is messy.
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.
A little harder than the real SAT. These tests can run slightly tougher than test day, which makes them good practice: if you can handle these, the real one should feel easier. No question appears in more than one test, Challenge Tests included.
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.
Free every day. Pro when you're serious.
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