Abstract Schools are under tremendous pressure to close achievement gaps and increase students' college and career readiness. Research has shown that students' interactions with rigorouus curriculum and instructional practices positively impact their postsecondary outcomes (e.g. Adelman, 2006; Oakes and Saunders, 2007). With an established standard of rigor already existing in many high schools in the form of Advanced Placement courses, a majority of high schools could increase the rigor of their...