Statement of Purpose and Method of Study: The purpose of this study was to examine the possible relationships between co-curricular scheduling models, student choice of co-curricular courses, and scores on the English Language Arts and mathematics Mississippi Academic Assessment Program (MAAP) scale for students in sixth, seventh, and eighth grade. The data for the research study were collected from sixth-, seventh-, and eighth-grade schools identified with unique co-curricular scheduling models. For the co-curricular scheduling model which allows for student choice, the researcher collected data on student choice of co-curricular course. A causal-comparative quantitative research design allowed the researcher to compare the dependent variables of English Language Arts and mathematics MAAP scale scores to the school co-curricular scheduling model and student choice of co-curricular course. Findings and Conclusions: This study indicated that the school choice of the co-curricular scheduling model influenced student performance in the English Language Arts and mathematics MAAP scores for sixth-, seventh-, and eighth-grade students. Of the four co-curricular scheduling models identified in the research study, the co-curricular scheduling model allowing for student choice of co-curricular course yielded the highest mean scale scores on the English Language Arts and mathematics MAAP assessment. Among the three other co-curricular scheduling models identified that do not allow for student choice, the assigned, year-long co-curricular course scheduling model yielded higher means on the English Language Arts and mathematics MAAP assessment than the assigned, semester-long or daily, rotational co-curricular scheduling model for sixth-, seventh-, and eighth-grade students. Findings also revealed the lack of statistical significance on English Language Arts and mathematics MAAP performance between student choice of co-curricular courses in art, music, and athletics for sixth-, seventh-, and eighth-grade students. The findings revealed that allowing students to choose co-curricular courses significantly impacts student performance on the English Language Arts and mathematics MAAP, no matter which co-curricular course is chosen. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]