The SAT Reasoning Test (formerly Scholastic Aptitude Test and Scholastic Assessment Test, pronounced as three separate letters) is a standardized test for college admissions in the United States. The   SAT   is  owned,  published,   and   developed   by the

College Board, a not-for-profit organization in the United States. It was formerly developed, published, and scored by the Educational Testing Service which still administers the exam. The test is intended to assess a student's readiness for college. It was first introduced in 1901, and its name and scoring have changed several times. The current SAT Reasoning Test, introduced in 2005, takes three hours and forty-five minutes, and costs $47 ($75 International), excluding late fees. Possible scores range from 600 to 2400, combining test results from three 800-point sections (Mathematics, Critical Reading, and Writing). The College Board states that the SAT measures literacy and writing skills that are needed for academic success in college. They state that the SAT assesses how well the test takers analyze and solve problems—skills they learned in school that they will need in college. The SAT is typically taken by high school sophomores, juniors and seniors. Specifically, the College Board states that use of the SAT in combination with high school grade point average (GPA) provides a better indicator of success in college than high school grades alone, as measured by college freshman GPA. Various studies conducted over the lifetime of the SAT show a statistically significant increase in correlation of high school grades and freshman grades when the SAT is factored in.

SAT consists of three major sections: Critical Reading, Mathematics, and Writing. Each section receives a score on the scale of 200–800. All scores are multiples of 10. Total scores are calculated by adding up scores of the three sections. Each major section is divided into three parts. There are 10 sub-sections, including an additional 25-minute experimental or "equating" section that may be in any of the three major sections. The experimental section is used to normalize questions for future administrations of the SAT and does not count toward the final score. The test contains 3 hours and 45 minutes of actual timed sections, although most administrations, including orientation, distribution of materials, completion of biographical sections, and eleven minutes of timed breaks, run about four and a half hours long. The questions range from easy, medium, and hard depending on the scoring from the experimental sections. Easier questions typically appear closer to the beginning of the section while harder questions are towards the end in certain sections. This is not true for every section but it is the rule of thumb mainly for math and sentence completions and vocabulary.

The Critical Reading (formerly Verbal) section of the SAT is made up of three scored sections: two 25-minute sections and one 20-minute section, with varying types of questions, including sentence completions and questions about short and long reading passages. Critical Reading sections normally begin with 5 to 8 sentence completion questions; the remainder of the questions is focused on the reading passages. Sentence completions generally test the student's vocabulary and understanding of sentence structure and organization by requiring the student to select one or two words that best complete a given sentence. The bulk of the Critical Reading section is made up of questions regarding reading passages, in which students read short excerpts on social sciences, humanities, physical sciences, or personal narratives and answer questions based on the passage. Certain sections contain passages asking the student to compare two related passages; generally, these consist of shorter reading passages. The number of questions about each passage is proportional to the length of the passage. Unlike in the Mathematics section, where questions go in the order of difficulty, questions in the Critical Reading section go in the order of the passage. Overall, question sets towards the beginning of the section are easier, and question sets towards the end of the section are harder.

The writing section of the SAT, based on but not directly comparable to the old SAT II subject test in writing, includes multiple choice questions and a brief essay. The essay sub-score contributes about 28% towards the total writing score, with the multiple choice questions contributing 70%. This section was implemented in March 2005 following complaints from colleges about the lack of uniform examples of a student's writing ability and critical thinking.

The multiple choice questions include error identification questions, sentence improvement questions, and paragraph improvement questions. Error identification and sentence improvement questions test the student's knowledge of grammar, presenting an awkward or grammatically incorrect sentence; in the error identification section, the student must locate the word producing the source of the error or indicate that the sentence has no error, while the sentence improvement section requires the student to select an acceptable fix to the awkward sentence. The paragraph improvement questions test the student's understanding of logical organization of ideas, presenting a poorly written student essay and asking a series of questions as to what changes might be made to best improve it. The essay section, which is always administered as the first section of the test, is 25 minutes long. All essays must be in response to a given prompt. The prompts are broad and often philosophical and are designed to be accessible to students regardless of their educational and social backgrounds. For instance, test takers may be asked to expound on such ideas as their opinion on the value of work in human life or whether technological change also carries negative consequences to those who benefit from it. No particular essay structure is required, and the College Board accepts examples "taken from [the student's] reading, studies, experience, or observations." Two trained readers assign each essay a score between 1 and 6, where a score of 0 is reserved for essays that are blank, off-topic, non-English, not written with a Number 2 pencil, or considered illegible after several attempts at reading. The scores are summed to produce a final score from 2 to 12 (or 0). If the two readers' scores differ by more than one point, then a senior third reader decides. The average time each reader/grader spends on each essay is less than 3 minutes.