The ACT is a standardized college admissions test used in the United States. It measures high school students' knowledge in English, Math, Reading, and Science, with an optional Writing section. The test is widely accepted by colleges and universities for admissions purposes. The ACT consists of four required multiple-choice sections, each scored on a 1-36 scale. The composite score is the average of these sections. Preparation strategies include taking practice tests, reviewing core subjects, and developing effective time management skills.