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.
Nonlinear equations and systems · Lesson 4
The absolute value is the distance of from 0, so it is never negative. means is 4 units from 0: or .
Isolate the absolute value first. In , subtract 1 and divide by 2 before touching the bars: .
Then split into two cases. gives , and gives .
Count before you solve. Once is isolated, with a number: if , there are two cases (and, when is linear in , two solutions). If , there is one case, (one solution when is linear). If , there are none, since a distance can't be negative.
When also appears outside the bars, as in , solve both cases and check each answer in the original. A case can produce a value that fails. Here gives , but then the right side is , and an absolute value can't equal a negative, so fails. The other case, , gives and , which checks: . The only solution is .
On a graph, is a V with its corner at . The solutions of are where the V meets the horizontal line .
What are all the solutions to the given equation?
What is the sum of the solutions to the given equation?
The two cases apply to the absolute value alone. In , writing is wrong. Clear everything outside the bars first, then split.
has no solution, even though and both give numbers. An absolute value is never negative. And has exactly one solution, , not two.
Graph each side as its own . Type abs( or the | key for the bars: and . Click the points where the graphs cross; their -coordinates are the solutions, here and 3.
This is especially useful when is also outside the bars, as in : graph and , and they cross only at . Every crossing on the graph is a real solution, so there is nothing to check afterward.
For a simple equation such as , the two cases take seconds by hand.
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.