In this study, we identified factors that influence the academic performance of grade 6 students in a large city school system in language arts and mathematics. For language arts, five student variables, seven class variables, and two school level variables accounted for approximately 50 per cent, 75 per cent, and 90 per cent of the initial variability at the corresponding levels. For mathematics, seven student, five class, and three school level variables accounted for approximately 40 per cent, 60 per cent, and 90 per cent of the initial variability at the school level. Taken together, the results reveal that the majority of variability is at the student level, and additional variables need to be identified to better explain the variability at this level.