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 same order and on the same timing as the digital SAT, 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 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 same order as the digital SAT: 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 are built from harder material in every module.
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 functions · Lesson 4
A zero of a function is an input with . On the graph, a zero is an -intercept, the point .
Zeros and factors go together: ** is a factor of exactly when **. So the factor means a zero at , and a factor means a zero where , at . Going the other way, if , then is a factor. More generally, is the remainder when is divided by .
Crossing or touching. If a factor appears once, such as , the graph crosses the -axis there. If it appears squared, such as , the graph touches the axis and turns back, because a square is never negative and doesn't change sign. In general an even power touches and an odd power crosses.
End behavior. For large positive or negative , the term with the highest power wins. Multiply the leading terms of the factors to get it: starts with . With an odd degree, the two ends go opposite ways: if the leading coefficient is positive, the graph falls on the left and rises on the right. With an even degree, both ends go the same way: both up if the leading coefficient is positive, both down if it is negative.
The -intercept is . In factored form, set in every factor and multiply.
Which of the following is an -intercept of the graph of in the -plane?
The graph of the polynomial function is shown. Which of the following could define ?
The factor gives the zero , not 5. For a factor like , solve : the zero is , not 2. The choice with the sign flipped is a likely trap.
Two equations can have the same zeros and still have different graphs. If the graph touches the -axis and turns back, that factor is squared (an even power). If it crosses, the power is odd. Then check the ends of the graph to confirm the sign of the leading coefficient.
Type the polynomial, such as y = (x - 4)(2x + 3)(x + 1), and click the curve. Desmos marks the -intercepts as gray dots; click one to see its coordinates. A zero like shows as .
To test whether is a factor of a given , define p(x) in Desmos and type p(3). If it shows 0, is a factor. Any other value is the remainder.
For a graph printed in the question, type each choice and compare where it crosses or touches the -axis and which way its ends point.
How you’re doing across daily practice and full-length tests.
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, built from harder material: a hard Module 1, then a Module 2 made mostly of the hardest questions.
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.
Last updated October 7, 2026
Peakscor is an independent SAT® and AP® practice website at peakscor.com, built and run by its student founders in Houston, Texas. This policy explains what we collect, why, and what you can do about it. If anything here is unclear, email support@peakscor.com.
Some things are saved only in your browser’s local storage and are never sent to us: the calculator’s layout and saved entries, your practice difficulty, timing and exam (SAT or AP) choices, your best scores on the Daily, today’s practice numbers, a test in progress, the questions you’ve seen recently, and the copies of missed questions in your mistake notebook. Your game and study settings, your practice and full-test results, your study plan and your diagnostic result are kept in your browser too, and a copy is saved to your guest account or account so they can follow you to another device (see below). You can remove the browser copies by clearing your browser’s site data for peakscor.com.
Your daily free-question count is kept in your browser and on our servers, counted per account and per browser, so the free limit works the same in a private window. The browser is identified only by a scrambled (hashed) version of its random ID, and each count is just a number of questions per difficulty for that day.
So your progress can save, Peakscor creates an anonymous guest account in the background when you visit. It has no name or email address. It is tied to a random ID created when you first visit. It stores:
If you join a teacher’s class, we store that you are in the class and the nickname you choose for it. Please don’t use your real name. The teacher sees your nickname and a short summary of your studying: active days in the last week, Learn lessons completed and modules mastered, your diagnostic levels, your practice accuracy by topic, and whether you have finished their assignments. The teacher never sees your email address or your answers, and other students never see your data. If you leave the class, or the teacher removes you, the teacher no longer sees any of it. A teacher’s account stores the class name and its join code.
Like any website, our hosting providers process your IP address and basic request details (such as browser type) to deliver pages and keep the service secure. A sign-in token for your guest account or account is kept in your browser’s local storage. When someone makes an account, we keep the email address they signed up with and scrambled (hashed) versions of their IP address and browser ID for up to 31 days, only to stop disposable email addresses and limit how many accounts one network or browser can create. If a page breaks, your browser may send us a short error report: what went wrong, which page it happened on (without anything after the “?” in the address), the site version and your browser type. Email addresses and sign-in tokens are removed from it, and it doesn’t include your user ID or email address. We keep error reports for about 30 days. We don’t use advertising cookies or third-party analytics tools.
Only to run Peakscor: to sign you in, save and sync your progress, grade questions, show leaderboards, keep the service secure and fair, handle payments if you buy a plan, and reply when you contact us. We don’t use your data for advertising, and we don’t use it to train AI models.
We don’t sell or rent personal information. We use a small number of service providers who process data only to run Peakscor:
We may also share information if the law requires it, or to protect the safety of students or the security of the service.
Game leaderboards are public and show your display name and your scores. They never show your email address. If you join a class, its teacher sees the summary described under “Classes”. Nothing else about your account is public.
Peakscor is meant for students 13 and older, and we don’t knowingly collect personal information from children under 13. If you believe a child under 13 has made an account, email us and we will delete it.
These choices are available to everyone, wherever you live.
We keep account and guest data until it is deleted. When you delete your account, it is erased from our database right away. Copies in our providers’ encrypted backups are overwritten on their normal schedule, usually within a few weeks.
All traffic is encrypted. Every database table has access rules so that each student can read only their own records, and those rules are tested automatically whenever the code changes. No system is perfectly secure, so if you think something is wrong, tell us right away.
Peakscor is independent. It isn’t provided by or through any school, and we don’t receive student records from schools. A teacher can make a Peakscor class and invite students with a code; joining is up to each student, and the teacher sees only the class summary described under “Classes”.
If we change this policy, we will update the date at the top. If a change affects how we use data you’ve already given us, we will tell you on the site before it takes effect.
Questions or requests: support@peakscor.com.
Last updated October 5, 2026
These terms cover your use of Peakscor at peakscor.com. By using Peakscor, you agree to them. If you don’t agree, please don’t use the site.
You must be at least 13 years old. If you are under 18, please read these terms with a parent or guardian, and get their permission before buying a plan.
Keep your sign-in details private, use your own email address, and don’t share your account. You are responsible for what happens on your account. You can delete it at any time from the account menu.
The free plan is free and needs no card. Paid plans (Pro and Peak) unlock more practice, tests and lessons, as described on the Pricing page. Online payment has not launched yet. When it does, these rules apply:
Please don’t:
Peakscor’s questions, explanations, lessons, games and design are our original work and belong to Peakscor. You may use them for your own studying. Teachers and tutors who want to use them with students should email us first. Read how our questions are made.
If you send us feedback or report a problem with a question, we may use it to improve Peakscor without owing you anything.
Peakscor is an independent practice tool. It is not affiliated with, endorsed by or sponsored by the College Board. Our questions are original, SAT-style practice, not official test questions. Scores shown on Peakscor are estimates, and we don’t promise any particular result on the SAT or any AP exam.
SAT®, AP® and Advanced Placement® are trademarks registered by the College Board, which is not affiliated with, and does not endorse, Peakscor. PSAT/NMSQT® is a registered trademark of the College Board and the National Merit Scholarship Corporation, which are not affiliated with, and do not endorse, Peakscor. Bluebook™ is a trademark of the College Board. Desmos is a trademark of Desmos Studio PBC.
If you believe something on Peakscor copies your work or misuses your trademark, email support@peakscor.com and tell us what it is and where it appears. We will reply within one business day and take the content down while we review it.
We work hard to make Peakscor accurate and reliable, but it is provided “as is.” Questions or explanations may sometimes contain mistakes, and the site may sometimes be unavailable.
To the extent the law allows, Peakscor is not liable for indirect or consequential losses, and our total liability for any claim is limited to the amount you paid us in the 12 months before the claim, or $50 if you paid nothing.
You can stop using Peakscor at any time. We may suspend accounts that break these terms. If we ever shut Peakscor down, we will refund the unused part of any paid subscription.
These terms are governed by the laws of the State of Texas.
We may update these terms. We will change the date at the top, and tell you on the site about any important change before it takes effect.
Last updated October 5, 2026
Every question, passage, explanation and lesson on Peakscor is original SAT-style practice. None of it is an official SAT® or AP® question, and we are not affiliated with the College Board.
Scores on Peakscor are estimates based on how you do on our practice questions. They are not official scores and don’t predict an exact result.
If a question looks wrong, or you think something is too close to published material, email support@peakscor.com. We reply within one business day and take reported content down while we review it.
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