Every passage on the ACT has a central argument — a thesis that controls what belongs in the passage and what does not. Thesis and focus questions test whether you can identify that controlling idea, strengthen it, and recognize when a sentence wanders away from it. You will see 2 to 3 of these questions per test. They ask you to add thesis statements, choose topic sentences, decide whether to delete off-topic content, or select effective conclusions. The core skill is always the same: does this sentence serve the passage's main point?
Every passage on the ACT has a central argument — a thesis that controls what belongs in the passage and what does not. Thesis and focus questions test whether you can identify that controlling idea, strengthen it, and recognize when a sentence wanders away from it. You will see 2 to 3 of these questions per test. They ask you to add thesis statements, choose topic sentences, decide whether to delete off-topic content, or select effective conclusions. The core skill is always the same: does this sentence serve the passage's main point?
A strong thesis statement has four qualities: it is specific (states exactly what the passage will discuss), arguable (presents a position that could be debated), focused (narrow enough to be fully developed), and relevant (directly addresses the passage topic). The thesis usually appears at the end of the introduction or the beginning of the passage, and every other element in the passage should connect back to it.
Weak: "There are many interesting things about urban planning." — Too vague, not arguable, no specific focus. Strong: "The 15-minute city concept revolutionizes urban living by integrating residential, commercial, and public spaces within walking distance." — Specific concept, clear position, focused scope.
When the ACT asks you to choose or add a thesis, look for the option that is most specific while still encompassing the entire passage. The broadest option is almost always wrong. A thesis that could apply to any passage on the same general topic is too vague.
Thesis and focus questions come in five forms, and recognizing which type you are facing speeds up your approach.
Add a thesis statement (~25%). The question asks which sentence would most effectively establish the central claim. Look for introductions missing a clear controlling idea. The correct answer will be specific, arguable, and broad enough to cover the entire passage.
Choose a topic sentence (~30%). The question asks which choice best introduces a paragraph. The correct answer must do two things simultaneously: connect to the thesis and preview the paragraph's content. If it only does one, it is wrong.
Delete off-topic content (~20%). The question asks whether a sentence should be kept or deleted. Apply the "So what?" test: Does this sentence advance the main argument? Provide necessary evidence? Address a counterargument? Transition between ideas? If the answer to all four is no, delete it. On the ACT, when you are unsure whether to keep or delete, default to delete — the test is more likely to ask you to remove irrelevant content than to keep it.
Improve paragraph focus (~15%). The question asks which choice most effectively maintains the paragraph's focus. Eliminate any option that introduces a tangent, broadens the scope unnecessarily, or contradicts the established direction.
Strengthen the conclusion (~10%). The question asks for the most effective closing. A strong conclusion synthesizes the passage's main ideas without merely repeating them and without introducing new topics. Any choice that brings up a new subject in the final sentence is wrong.
[1] Situated in the middle of San Francisco Bay, Angel Island served as the primary immigration station for the Pacific coast from 1910 to 1940. During those three decades, approximately one million immigrants—most of them from China, Japan, Korea, India, and the Philippines—passed through its processing facilities. Unlike Ellis Island, which welcomed European immigrants with relative speed, Angel Island was designed to enforce the Chinese Exclusion Act of 1882, subjecting Asian immigrants to weeks or even months of grueling interrogation.
The interrogation process at Angel Island was deliberately punishing. Immigration officials questioned detainees for hours, demanding exact details about their home villages: the number of steps in front of their house, the location of the nearest well, the names of neighbors in adjacent rows. Officials then cross-referenced these answers with testimony from family members already in the United States. A single inconsistency—a wrong number of windows, a misremembered direction—could result in deportation.
The emotional toll of detention left a permanent mark on Angel Island itself. Carved and brushed into the wooden walls of the barracks, hundreds of poems in Chinese characters survive today. These poems express longing for home, fury at unjust treatment, and determination to endure. In 1970, a state park ranger discovered the poems during a routine inspection, and their preservation transformed the abandoned station into a nationally recognized historical site. [6]
Topic development questions test whether you can identify the strongest, most specific evidence to support a claim. You will see 2 to 3 of these per test, and they follow a simple principle: the ACT always rewards concrete details over vague generalizations. When an answer choice offers a specific number, a measurable result, or a named example, it is almost always correct. When a choice says "many people benefited" or "various improvements occurred," it is almost always wrong. Training yourself to crave specificity is the single most effective strategy for this question type.
Evidence questions announce themselves through their question stems. Look for phrases like "Which choice provides the most specific example?" or "Which choice best supports the claim?" or "Which choice offers the most relevant evidence?" or "Which choice most effectively illustrates the point?" When you see any of these, you know the test is asking you to evaluate the quality of support rather than grammar or punctuation.
These questions test four things simultaneously: specificity (concrete details vs. vague language), relevance (does the evidence directly support the claim?), logic (is there a clear connection between the evidence and the argument?), and development (does the evidence build upon the topic effectively?). Wrong answers typically fail on one or more of these dimensions — they are either too general, off-topic, contradictory, or weaker than another option.
Not all evidence is created equal. Think of evidence quality as a spectrum from weakest to strongest.
Vague statements are the weakest form — words like "many," "various," "significant," and "considerable" tell the reader almost nothing. "The results were impressive" sounds positive but provides zero information about what actually happened.
General examples are slightly better but still lack precision. "Students often participate" acknowledges something is happening but does not quantify it or make it tangible.
Specific examples name concrete things — a date, a place, a program, a particular outcome. "The chess club meets every Tuesday" gives the reader something they can picture.
Concrete details add measurable precision. "25 students attend weekly meetings" is stronger than just naming the club because it quantifies the participation.
Statistical evidence is the strongest form. "Membership increased 40% this year" or "87% of participants reported satisfaction" gives the reader hard data they can evaluate.
On the ACT, when you are choosing between answer options, climb the spectrum. Eliminate vague options first, then choose the most specific, most concrete remaining option. If one choice contains a percentage or a specific number while the others use words like "many" or "various," the specific choice is almost certainly correct.
The origins of golf are fiercely debated, but most historians trace the modern game to fifteenth-century Scotland, where players used curved sticks to knock pebbles across the sandy dunes along the eastern coast. The game grew so popular that King James II banned it in 1457 because it was distracting young men from archery practice, which Scotland needed for national defense. Despite repeated royal prohibitions, golf persisted, and by the sixteenth century even Scottish kings had taken up the sport.
The founding of the Royal and Ancient Golf Club of St Andrews in 1754 marked a turning point. The club established important rules for the game. Before St Andrews codified its regulations, courses varied wildly — some had five holes, others had twenty-five, and players often made up rules on the spot. The standardization allowed clubs across Scotland and eventually England to compete under a common framework.
Golf's expansion beyond Britain accelerated in the late nineteenth century. Scottish immigrants carried the game to North America, Australia, and South Africa, establishing courses that adapted to local landscapes. The first American golf club, Shinnecock Hills on Long Island, opened in 1891. By the early twentieth century, figures like Francis Ouimet — an amateur from a working-class background — helped transform golf from an aristocratic pastime into a sport with broader public appeal.
Relevance questions test whether you can distinguish between information that supports the passage's main idea and information that is merely interesting or tangential. You will see 8 to 10 of these per test, making up 15 to 20 percent of the English section. They are not testing grammar — they are testing your editorial judgment. The golden rule: every detail in a passage must serve the main focus. Information can be fascinating, completely true, and beautifully written, but if it does not support the central argument, it does not belong.
Relevance questions announce themselves with distinctive phrasing. "Given that all the choices are true" is the clearest signal — it tells you that grammar and factual accuracy are not the issue. All four options are correct on those fronts. Your job is to choose the one that best supports the passage's focus.
Other common stems include "Which choice provides the most relevant information?" and "The writer is considering deleting the underlined sentence. Should the writer make this deletion?" In every case, the question is asking you to evaluate relevance to the main idea, not correctness of the content itself.
The most common mistake students make is choosing the option they find most interesting rather than the one that is most relevant. A vivid historical detail about ancient Rome is a tempting choice, but if the paragraph is about modern architecture, that detail does not belong. Train yourself to ask one question before selecting your answer: "Does this directly support the specific point this paragraph is making?"
Every relevance decision comes down to three checks.
Check 1 — Identify the paragraph's main focus. Before evaluating any answer choice, determine what the paragraph is actually about. Read the topic sentence and the sentences surrounding the underlined portion. Summarize the paragraph's point in five to seven words. Every answer choice must be measured against this summary.
Check 2 — Test each choice against the focus. For each option, ask: Does this directly support, illustrate, or advance the paragraph's main point? If it introduces a new topic, provides background that is not needed, or wanders into tangential territory, it fails the relevance test.
Check 3 — Choose the most directly relevant option. When multiple choices seem related to the topic, pick the one with the tightest connection to the specific claim being made. A sentence about general benefits of technology is less relevant than a sentence about the specific technology the paragraph discusses.
For deletion questions, apply the flip side of the same logic. Ask: Would removing this sentence hurt the paragraph's argument? If yes, keep it. If the paragraph reads just as well — or better — without the sentence, delete it. When the sentence is off-topic, redundant, or disrupts the flow, deletion is almost always correct.