Reach your peak.
A quick run every day, an explanation for every question, and full-length tests on official timing.
Full-length tests
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
A quick run with three hearts. String right answers together and the questions get harder and the points multiply.
Every question is tagged by domain and skill, and every answer comes with an explanation.
Practice any single skill at any difficulty, or just the questions you got wrong.
Come back tomorrow and climb. Progress shows your accuracy and your strongest skills.
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.
9 easy, 9 medium, 9 hard and 9 challenging questions free every day, each with a full explanation. Filter by section, domain, skill and difficulty. Resets at midnight Central Time.
Take any test on official timing, extended 1.5× time, or untimed to focus purely on accuracy.
Four modules in official order. The second module of each section adapts to how you did on the first.
1,023 essential SAT words. Browse the list, flip flashcards, or quiz yourself.
Accuracy across daily practice and full tests, your strongest skills, and the ones that need the most help.
PEAK Survivor, Hole and Peak Defense: three games powered by SAT practice questions.
Explanations
Not just the right letter: how to get there, and why the tempting answer is wrong.
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?
Check with $100: $100→then$120→then$96
Up 20% means × 1.20. Down 20% means × 0.80.
1.20 × 0.80 = 0.96
The final price is 96% of the original. That’s B.
The 20% cut is taken from the higher price, so it removes more than the 20% increase added.
Test day
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.
27 questions32 min
27 questions32 min
10 min
22 questions35 min
22 questions35 min
98 questions · 2 hr 14 min of testing, plus the break
Plans
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.
$0no card needed
$20a month, or $200 a year
$29a month, or $280 a year
Prices in US dollars. Cancel anytime.
FAQ
The Daily, plus 36 practice questions every day: 9 easy, 9 medium, 9 hard and 9 challenging, each with a full explanation. Full-length Test A, Challenge Test 1 and all 1,023 vocabulary words are free too, as are the 20-question diagnostic, each Learn module’s overview and first lesson, and PEAK Survivor’s first map. 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, and every game map and level. 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 Central Time. You get a fresh 9 easy, 9 medium, 9 hard and 9 challenging.
No. Peakscor is an independent SAT practice tool, not affiliated with the College Board. Scores shown are estimates.
Free, no card.
Inference and margin of error · Lesson 1
A population is the whole group you want to know about, such as all 2,500 students at a school. A sample is the part of it you actually ask or measure. When the sample is chosen at random, every member of the population has a fair chance to be picked, so the sample tends to look like the population. That is what lets you use it to estimate.
Scaling a proportion. Suppose a random sample of 60 of those students finds that 18 of them play an instrument. The sample proportion is , or 30%. The best estimate for the whole school is the same proportion of the population: students.
Scaling a mean. If a random sample of a town's 4,000 households has a mean of 1.5 cars per household, the best estimate of the total number of cars in those households is . A mean is already per member, so you multiply it by the number of members in the population, not by the sample size.
Use careful language. 750 is the best estimate, not a promise: a different random sample would most likely give a slightly different number. Lesson 2 shows how a margin of error describes that uncertainty.
Read the question's last line twice. It may ask about the group in the sample, the other group, a difference between two groups, or a count instead of a percent.
Based on the sample, which of the following is the best estimate of the number of students at the high school who walk to school?
Based on the sample, which of the following is the best estimate of how many more of the county's registered voters plan to vote for Bell than for Ruiz?
A choice often matches a number from the sample itself, such as the count of people who answered yes. The question asks about the population, so the sample count has to be scaled up to the population's size.
Surveys have more than one category. If the question asks how many do not own a bike, or how many more chose one option, a choice built from the wrong category may be waiting. Underline the group the question names before you compute.
A mean is already per member, so multiply it by the population size. Dividing it by the sample size first, or multiplying by the sample size as well, gives a number that describes nothing in the problem.
Desmos doesn't speed up these questions. There is nothing to graph: the work is one proportion and one multiplication.
You can still use it as a calculator to avoid slips, for example by typing (42/150)*1800 on a line to see 504. A handheld calculator or quick mental math does the same job just as fast.
Choose a section, then practice a whole domain or drill a single skill.
Each test mirrors the digital SAT: 98 questions across four modules, 2 hr 14 min on official timing.
Same 98-question format, but every question is drawn from the toughest SAT material: Challenging-tier math throughout and the hardest reading.
Study the classic SAT vocabulary list. Browse, flip flashcards, or quiz yourself.
Practice free every day. Pro removes the limits. Peak adds the full course and a plan to test day.
Prices in USD. Switch or cancel your plan at any time.
Online payment hasn’t launched, so nothing here asks for a card. Everything on the free plan stays free.
Save your progress and pick up where you left off.
Your account keeps game coins, characters and map progress in sync across devices. Practice history stays on this device.