This study was conducted to find out the relationship of the collective efficacy, mastery math and reading experiences, and social-economic status with math and reading performances of female fifth-grade students in Ahvaz, using multi-level analysis. The sampling was done on two levels: on the school level, 20 schools with 163 teachers (the whole population of the 4th educational county in Ahvaz), and on the student level, 1034 fifth-grade students of the elementary schools (the total population) were selected. Also, a sample of 100 teachers were selected, separately from other educational counties (not including county 4), to analyze the reliability and validity of the scale of collective efficacy. The students completed the questionnaire of social-economic status and the teachers completed the scales of self-efficacy and collective efficacy. By the way, the students' math and reading grades of the previous year and also the math and reading grades of their fifth grade were obtained from their files, as the mastery math and reading experiences and math/reading performance, respectively. The results indicated that schools were significantly different in collective efficacy. And mastery math experiences, mastery reading experiences and the social-economic status of the students, separately, predicted the variability of the collective efficacy among schools. Also, the schools were significantly different in math performance but they showed no significant difference in the reading performance.Furthermore, collective efficacy and social- economic status were not predictors of math performance among schools, but mastery math experience predicted the math performance among schools.