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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.

A Peakscor full-length test in progress: Reading and Writing, Test A, Module 1 of 4, question 7 of 27, with the passage, four answer choices, a highlighter, a 24:18 timer and Flag, Back and Next buttons.

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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.

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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.

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PEAK Survivor, Hole and Peak Defense: three games powered by SAT practice questions.

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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: $100then$120then$96

  1. Turn each change into a multiplier.

    Up 20% means × 1.20. Down 20% means × 0.80.

  2. Apply them in order.

    1.20 × 0.80 = 0.96

  3. Read the answer.

    The final price is 96% of the original. That’s B.

  4. 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.

  1. Reading & Writing · Module 1

    27 questions32 min

  2. Reading & Writing · Module 2

    27 questions32 min

    Adapts to how you did on Module 1.

  3. Break

    10 min

  4. Math · Module 1

    22 questions35 min

  5. 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

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Start free daily practice

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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.

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Two-variable data · Lesson 2

The line of best fit

A line of best fit is a straight line drawn through the middle of a linear scatterplot. It models the data: for any xx-value, it gives a predicted yy-value. The SAT usually gives you the line, drawn on the graph or as an equation such as y=2.4x+15y = 2.4x + 15.

Predicting. To predict yy for a given xx, substitute xx into the equation, or go up from xx to the line (not to a dot) and across to the yy-axis. A dot is an actual value. The line gives the predicted value.

Slope. The slope is the *predicted change in yy for each increase of 1 in xx*. If xx is a weight in kilograms and yy is a price in dollars, a slope of 2.4 means the price is predicted to rise 2.4 dollars for each additional kilogram. It is a per-unit change, not a total, and it describes the model, not exactly what happens for each individual.

**yy-intercept.** The yy-intercept, 15 here, is the predicted yy-value when x=0x = 0. When x=0x = 0 is far outside the data, that prediction is unreliable, and when x=0x = 0 makes no sense in context, it has no real-world meaning.

Actual versus predicted. For one data point, actual minus predicted is called the residual. A dot above the line has an actual value greater than predicted (positive residual). A dot below the line has an actual value less than predicted (negative residual).

Predictions far outside the range of the data are less trustworthy, because the trend may not continue.

Eight data points and a line of best fit123456789246810121416182022242628300xy
Eight data points and a line of best fit Scatterplot of 8 points, (1, 4), (2, 10), (3, 10), (4, 14), (5, 16), (6, 22), (7, 22) and (8, 26), with a rising line of best fit through (0, 2) and (8, 26), so the line predicts 3 more for each increase of 1 in x. At x = 6 the line predicts 20 and the dot is at 22, above the line: residual 22 − 20 = 2. At x = 5 the line predicts 17 and the dot is at 16, below the line: residual −1.

Worked example Easy

The scatterplot shows the number of hours each of 9 students studied for a quiz and the student's score on the quiz, along with a line of best fit.
Hours studied and quiz score for 9 students, with a line of best fit12345678910404550556065707580859095100Hours studiedQuiz score
Hours studied and quiz score for 9 students, with a line of best fit Scatterplot of 9 points: (1, 55), (2, 65), (3, 60), (4, 75), (5, 70), (6, 70), (7, 90), (8, 85) and (9, 95). A rising line of best fit passes through (0, 50) and (10, 100).

Based on the line of best fit, what is the predicted quiz score for a student who studied 6 hours?

  1. 3030
  2. 5656
  3. 7070
  4. 8080Answer

How to solve it

  1. Find the line's slope from the two points it passes through: 100−5010−0=5\frac{100 - 50}{10 - 0} = 5. The yy-intercept is 50, so the line is y=5x+50y = 5x + 50.
  2. Substitute x=6x = 6: y=5(6)+50=80y = 5(6) + 50 = 80.
  3. On the graph, go up from 6 to the line, not to the dot at 70, and across: the line is at 80.

Why each choice is right or wrong

  • A. Incorrect. This multiplies the slope by 6 and leaves out the yy-intercept: 5(6)=305(6) = 30. The prediction is 5(6)+505(6) + 50.
  • B. Incorrect. This adds 6 to the intercept, 50+6=5650 + 6 = 56, as if the score rose 1 point per hour. The line rises 5 points per hour, so 6 hours add 30.
  • C. Incorrect. 70 is the actual score of the student who studied 6 hours, the dot below the line. The question asks for the value predicted by the line.
  • D. Correct. The line passes through (0, 50) and (10, 100), so it is y=5x+50y = 5x + 50, and 5(6)+50=805(6) + 50 = 80.

Worked example Medium

A scatterplot shows the age xx, in years, and the selling price yy, in thousands of dollars, of 20 used cars of one model. The line of best fit for the data is y=−1.6x+24.5y = -1.6x + 24.5.

Which statement is the best interpretation of the slope of the line of best fit in this context?

  1. For each additional year of age, the predicted price decreases by 1.6 thousand dollars.Answer
  2. The price of each car dropped by exactly 1.6 thousand dollars for every year of its age.
  3. A car of this model that is 0 years old has a predicted price of 24.5 thousand dollars.
  4. Over its whole life, a car's predicted price decreases by a total of 1.6 thousand dollars.

How to solve it

  1. The slope is the number multiplying xx: −1.6-1.6.
  2. Slope is the change in predicted yy for each increase of 1 in xx. Here xx is in years and yy is in thousands of dollars.
  3. So for each additional year of age, the predicted price goes down by 1.6 thousand dollars (1,600 dollars).

Why each choice is right or wrong

  • A. Correct. The slope, −1.6-1.6, is the change in the predicted price, in thousands of dollars, for each additional year of age.
  • B. Incorrect. The line describes predicted prices, not what happened to each car. Actual prices are scattered above and below the line, so no car is guaranteed to drop by exactly that amount.
  • C. Incorrect. This is a correct reading of the yy-intercept, 24.5, not of the slope. The question asks about the slope.
  • D. Incorrect. This treats the slope as a total. A slope of −1.6-1.6 is the change for each single year, so over several years the predicted drop adds up to much more than 1.6 thousand dollars.

Trap Reading a dot instead of the line

When a question says based on the line of best fit, the answer comes from the line. A dot at that xx-value is an actual data value, and the SAT often lists it as a choice.

Trap Treating the slope as a total

The slope is the change for one unit of xx. For an increase of 10 units, the predicted change is 10 times the slope. The yy-intercept never enters a difference between two predictions, because it is in both and cancels.

Trap Getting the residual's sign backward

Residual means actual minus predicted: positive for a dot above the line, negative for a dot below it. A choice with the right size and the wrong sign is a common trap.

Desmos When Desmos is faster

When the line is given as an equation, type it as a function, such as f(x)=2.4x+15f(x) = 2.4x + 15, and on the next line type f(6)f(6). Desmos shows the predicted value, 29.4.

To go backward (which xx gives a predicted yy of 27?), graph y=2.4x+15y = 2.4x + 15 and y=27y = 27 and click the point where they cross. Its xx-coordinate, 5, is the answer.

If a question gives raw data in a table, add a table in Desmos, type the values in the x1x_1 and y1y_1 columns, and on a new line type y1∼mx1+by_1 \sim mx_1 + b. Desmos fits the line and shows the values of mm and bb.

For one-step predictions with clean numbers, mental math is just as fast.

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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.

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Same 98-question format, but every question is drawn from the toughest SAT material: Challenging-tier math throughout and the hardest reading.

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Study the classic SAT vocabulary list. Browse, flip flashcards, or quiz yourself.

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