This paper estimates the impact of the College Level Examination Program (CLEP) examination, a collegelevel exam that offers credit for student mastery of a content area in lieu of completing a course. Using a regression discontinuity design, we find that passing a CLEP exam leads to a 17 percent (5.7 percentage points) increase in associate degree completion for students at two-year colleges and a 2.6 percent (1.2 percentage point) increase in bachelor's degree completion for students at four-year colleges. CLEP also serves and impacts subpopulations historically hard to track in educational data. For example, two-year college enrollees who earn a credit-granting CLEP score and are in the military, older than 24, and were home schooled are 18.1, 19.5, and 62.8 percent more likely to obtain an associate degree, respectively. The impacts from this inexpensive, credit-producing intervention are at least as large in magnitude as most other programs designed to improve degree completion. *The views do not reflect those of the College Board. Michael Hurwitz is a full time employee of the College Board. Jonathan Smith was formerly a full-time employee and currently acts in a consulting capacity. Jason Lee was a summer intern. Angela Boatman has no connections to the organization. 2016 (NCES 2016-144), Undergraduate Retention and Graduation Rates.