A key high school's score, often measured by the Grade Point Average (GPA), plays a crucial role in college admissions. The average GPA required for a key high school is typically around 3.5 to 4.0 on a 4.0 scale. This range is considered competitive and aligns with the expectations of most selective colleges and universities.

The reason for this GPA range is rooted in the competitive nature of college admissions. As more students apply to top institutions, the average GPA of admitted students tends to rise. According to data from the National Center for Education Statistics (NCES), the average GPA of students admitted to the most selective colleges in 2020 was 3.8. This indicates that a GPA above 3.5 is often necessary to stand out in the admissions process.

Moreover, a high GPA demonstrates academic rigor and a strong work ethic, which are qualities highly valued by colleges. It also indicates that a student has successfully navigated a challenging curriculum, which is an important factor for admissions committees. For instance, a study published in the Journal of College Admission found that a higher GPA is positively correlated with higher academic performance in college.

In addition to GPA, other factors such as standardized test scores, extracurricular activities, and letters of recommendation also contribute to a student's overall application. However, a strong GPA is often the foundation upon which other qualifications are built. Therefore, aiming for a GPA of 3.5 to 4.0 is advisable for students aiming to attend a key high school and subsequently gain admission to a competitive college.