Research on high school math course taking documents the advantages of starting high school at or beyond Algebra 1. Fewer studies examine differentiation into remedial, general, and honors Algebra 1 course types by course rigor. This study examines how course grades and course rigor are associated with math attainment among students with similar eighth-grade standardized math test scores. Students who earned an A in remedial courses had lower attainment than students with a D in general Algebra 1. Students with an A in general Algebra 1 had lower attainment than students with median grades in honors Algebra 1.