Louis C. Leithold, a longtime high school mathematics instructor who influenced the way calculus is taught in schools across the country, died April 29 in Pacific Palisades, Calif. He was 80. Mr.

For decades, high school students hoping to attend the most selective colleges in the country have received the same recommendation: Take the most rigorous courses possible. And over that time, ...

An analysis found that in this year's College Scholastic Ability Test (CSAT), test-takers who choose calculus in math and language and media in Korean will have an advantage. Jongro Academy said on ...