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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.
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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: $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
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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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Central Ideas and Details · Lesson 1
The main idea: the claim the whole passage supports
A main idea question asks for the one claim the whole passage supports. Many informational passages work like a small argument: a sentence or two of background, some evidence, and a point that the evidence supports. The main idea is that point. It is often a researcher's conclusion or the writer's own claim.
Before you look at the choices, finish this sentence in your own words: Mostly, this passage says that... Keep it short. Then look for the choice closest to your sentence.
Test each choice with two questions. First, does the passage support every part of it? Second, does it state the point the whole passage supports, or only one piece of evidence for that point? The right answer passes both tests. A choice that fails either one is wrong, however good it sounds.
The main idea is often stated in a single sentence, such as a researcher's conclusion at the end. A choice that restates that sentence can be right. What makes a choice a mere detail is that it repeats one piece of evidence and leaves out the point that evidence supports.
The wrong answers fall into a few patterns. The table below names them. You will see all of them again in the lessons that follow.
| Pattern | What it looks like | How to catch it |
|---|---|---|
| True detail | Repeats a fact from one sentence of the passage | Ask: is this the point, or a piece of evidence for the point? |
| Too broad or too strong | Stretches the claim to all, most or always, or compares with things the passage never studied | Check the scope: who and what did the passage actually cover, and how firmly? |
| Outside claim | Sounds reasonable, maybe even true in the real world, but the passage never says it | Point to the words in the passage that support it. If nothing in the text supports it, cross the choice out. |
| Distortion | Uses the passage's words but changes the cause, the group or the degree | Compare the choice word by word with the sentence it comes from. |
| Reversal | States the opposite result, or swaps cause and effect | Ask which way the passage's relationship runs. |
Worked example Easy
Many towns have tried to slow traffic by lowering speed limits, but drivers often ignore the signs. Urban planner Dalia Moreno studied a different approach in twelve neighborhoods: narrowing streets with planters and painted curb extensions. In nine of the neighborhoods, average driving speeds dropped within a month, and the drops lasted for the two years of her study. Moreno concludes that changing the shape of a street can slow drivers more reliably than changing the number on a sign.
Which choice best states the main idea of the text?
- Drivers in most towns ignore speed limits.
- Moreno's study suggests that physically narrowing streets can slow drivers more reliably than lowering speed limits can.Answer
- In nine of the twelve neighborhoods Moreno studied, average driving speeds dropped within a month and stayed lower for the two years of her study.
- Planters are the most popular way for towns to narrow their streets.
How to solve it
- Sum up the passage before reading the choices. The first sentence is background (lower speed limits often fail), the middle gives Moreno's evidence, and the last sentence states her conclusion.
- So: Mostly, this passage says that Moreno concludes narrowing streets slows drivers more reliably than changing the speed limit.
- Only the second choice matches that sentence. Each of the others either repeats one piece of evidence or says something the passage never states.
Why each choice is right or wrong
- A. Incorrect. The passage says many towns have tried lower limits and that drivers often ignore the signs. Drivers in most towns ignore speed limits stretches both the group and the degree, and this background sentence sets up the study rather than stating its point.
- B. Correct. The whole passage builds to Moreno's conclusion that changing the shape of a street can slow drivers more reliably than changing the number on a sign, and the study described in the middle is the evidence for it.
- C. Incorrect. This fact is in the passage, but it is one piece of evidence. It leaves out what Moreno concludes from it.
- D. Incorrect. The passage never compares planters with other ways to narrow streets or says how popular any method is. This is an outside claim.
Worked example Medium
Painter Ines Albarrán spent the 1970s making large canvases of a single subject: the walls of her neighborhood in Seville. Some show crumbling plaster; others show layers of posters pasted over one another. Critics at the time dismissed the series as repetitive. Art historian Leon Bakare argues that the repetition was the point. By returning again and again to the same walls, he writes, Albarrán recorded how her neighborhood changed over a decade, as old shops closed and new advertisements appeared. Seen together, the paintings work less like separate pictures than like a visual diary.
Which choice best states the main idea of the text?
- Albarrán painted crumbling plaster and layers of posters on the walls of her neighborhood in Seville.
- Critics in the 1970s were wrong to dismiss most art that repeats a single subject.
- Bakare argues that by painting the same walls many times, Albarrán created a record of how her neighborhood changed.Answer
- Bakare argues that Albarrán's paintings show that during the 1970s her neighborhood declined faster than other parts of Seville did.
How to solve it
- The first two sentences describe the paintings. The third gives the critics' view. Then Bakare's argument takes over the rest of the passage.
- Everything after Critics at the time dismissed the series explains Bakare's claim: the repetition recorded change, so the series works like a diary.
- Your summary: Bakare argues that Albarrán's repeated paintings of the same walls record how her neighborhood changed. That matches the third choice.
Why each choice is right or wrong
- A. Incorrect. This is accurate, but it only describes what some of the paintings show. It leaves out Bakare's argument, which most of the passage is about.
- B. Incorrect. The passage shows Bakare disagreeing with the critics only about Albarrán's series. Most art that repeats a single subject stretches his claim far beyond the passage.
- C. Correct. Bakare argues that the repetition was the point: by returning again and again to the same walls, Albarrán recorded how her neighborhood changed over a decade. The rest of the passage supports that claim.
- D. Incorrect. The passage never compares Albarrán's neighborhood with other parts of Seville, and it describes change (shops closing, new advertisements), not a decline measured against anywhere else. This is an outside claim.
Trap The true detail
The most tempting wrong answer is often copied almost word for word from the passage. It is true, so it feels safe. But a main idea question asks for the point of the whole passage, and one piece of evidence is not the point. If a choice matches only one sentence and leaves out what that sentence is evidence for, it is a detail.
Trap Too broad sounds important
A choice about all cities, most art or every species can sound like a big idea, and big ideas feel like main ideas. But a passage about one study, one town or one painter supports only the claims it actually makes: what that study found, and any conclusion the passage itself draws from it. When a choice reaches past what the passage claims, or makes a comparison the passage never makes, cross it out.
Practice
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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.
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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