The 10th grade, also known as sophomore year, is the second year of high school in the United States. Students typically range from 15 to 16 years old during this year. The curriculum often includes core subjects such as math, science, English, and social studies, along with elective courses that allow students to explore their interests. In 10th grade, students may also take standardized tests, such as the PSAT, to prepare for college admissions. This year is crucial for academic development, as it helps students build skills necessary for higher-level courses in their junior and senior years.