In 2015 Illinois mandated the education Teacher Performance Assessment (edTPA), a performance-based assessment to evaluate teaching readiness, as a part of the teacher licensure requirements. The new requirement aimed to benefit student learning by improving the teaching effectiveness of prospective teachers. This report estimates the effect of teachers hired after 2015 when edTPA was implemented on student test scores. We analyze the mathematics and reading scores of 4th and 8th graders documented in the National Assessment of Educational Progress (NAEP) from 2009 to 2017.