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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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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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Miss one, learn why.
Every question is tagged by domain and skill, and every answer comes with an explanation.
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Drill that skill.
Practice any single skill at any difficulty, or just the questions you got wrong.
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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
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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.
One-variable data · Lesson 5
Comparing two data sets
Many SAT data questions show two data sets and ask which statement compares them correctly. Compare two things separately: center (mean or median) and spread (range, interquartile range or standard deviation). One data set can have the greater center and the smaller spread at the same time.
With two box plots on the same scale, compare the median lines for center, and compare the box widths (IQR) or the distances between the whisker ends (range) for spread. With two lists or tables, compute the means or medians, and judge standard deviation by how far the values sit from the mean.
Adding the same number to every value moves the mean and the median by that number but leaves the spread alone: the range, the IQR and the standard deviation stay the same, because the distances between values don't change.
Read each choice in two halves. A choice can be right about center and wrong about spread, so check both halves before you pick it.
Worked example Medium
The box plots summarize the scores of the students in two sections of a chemistry class on the same test.
Which statement correctly compares the two sections' scores?
- Section 1 has the greater median and the greater interquartile range.Answer
- Section 1 has the greater median, and Section 2 has the greater interquartile range.
- Section 2 has the greater median, because its minimum and first quartile are greater.
- The interquartile ranges are equal, because each box holds the middle half of its section's scores.
How to solve it
- Center: the line inside each box is the median. Section 1's median is 80 and Section 2's is 75, so Section 1's is greater.
- Spread: the IQR is the width of the box. Section 1: . Section 2: . Section 1's is greater.
- Both halves favor Section 1.
Why each choice is right or wrong
- A. Correct. Section 1's median, 80, is greater than Section 2's, 75, and its IQR, , is greater than Section 2's, .
- B. Incorrect. The median half is right, but the IQR half is reversed. Section 2's box is the narrower one: , compared with for Section 1.
- C. Incorrect. This judges the center by the low end of each plot. Section 2's minimum and Q1 are greater, but the median is the line inside the box: 80 for Section 1 and 75 for Section 2.
- D. Incorrect. Each box does hold about half of its section's scores, but the IQR is the box's width, not its share of the data. The widths are 20 and 10.
Worked example Hard
Two groups of 10 customers each rated a new phone on a scale from 1 to 5. The table shows how many customers in each group gave each rating.
| Rating | Group A | Group B |
|---|---|---|
| 1 | 1 | 3 |
| 2 | 2 | 1 |
| 3 | 4 | 2 |
| 4 | 2 | 1 |
| 5 | 1 | 3 |
Which statement correctly compares the two groups' ratings?
- The means are equal, and group B's ratings have the greater standard deviation.Answer
- The means are equal, and group A's ratings have the greater standard deviation.
- The standard deviations are equal, because both groups' ratings range from 1 to 5.
- Group A has the greater mean, because its largest count, 4, is greater than group B's largest count, 3.
How to solve it
- Mean of A: . Mean of B: . The means are equal.
- Spread: in group A, 4 of the 10 ratings equal the mean, 3, and only 2 ratings are at the ends, 1 or 5. In group B, 6 of the 10 ratings are at 1 or 5, as far from the mean as the scale allows.
- Group B's ratings sit farther from the mean, so group B has the greater standard deviation.
Why each choice is right or wrong
- A. Correct. Both means are . Six of group B's ratings are 1 or 5, 2 away from the mean, while four of group A's ratings are exactly 3. Group B's ratings are farther from the mean, so its standard deviation is greater.
- B. Incorrect. This judges spread by the counts instead of the ratings. Group A's counts (1, 2, 4, 2, 1) vary more than group B's (3, 1, 2, 1, 3), but the counts are not data values. Group A's ratings cluster at the mean, 3.
- C. Incorrect. Both ranges are , but the range uses only the extremes. Group B has 6 ratings at the extremes and group A has only 2, so their standard deviations differ.
- D. Incorrect. This compares the counts, not the ratings. A count of 4 tells how many customers chose a rating, not how high the ratings are. Both means are .
Trap Right about center, wrong about spread
Choices often pair a correct comparison of centers with a wrong comparison of spreads, or the reverse. Check each half of a choice on its own.
Trap Judging spread by the counts
In a frequency table or bar graph, the spread of the data depends on where the values sit, not on how uneven the counts are. A tall stack in the middle means less spread; many values at both ends mean more.
Desmos When Desmos isn’t faster
Comparison questions often come as graphs or summaries, and the work is reading them, which Desmos can't do for you.
When both data sets are given as lists, you can type them as A = [...] and B = [...], then mean(A), mean(B), median(A), median(B), stdev(A) and stdev(B) on separate lines and compare. For frequency tables, use total(V*N)/total(N) from Lesson 2 for each group. For short lists like the ones on the SAT, reasoning about the halves is often quicker.
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.
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