The College Boards started as achievement tests designed to measure students' mastery of college preparatory subjects. Admissions testing has significantly changed since then with the introduction of the Scholastic Aptitude Test, Lindquist's creation of the ACT, renewed interest in subject-specific assessments, and current efforts to adapt K-12 standards-based tests for use in college admissions. We have come full circle to a renewed appreciation for the value of achievement tests. Curriculum-based achievement tests are more valid indicators of college readiness than other tests and have important incentive or signaling effects for K-12 schools as well: They help reinforce a rigorous academic curriculum and create better alignment of teaching, learning, and assessment along the pathway from high school to college. (Contains 17 notes.)