Students with emotional and behavioral disabilities (EBD) show low academic growth and are most likely to be placed in restrictive learning environments. This research study explored correlations between class settings and the academic achievement of middle school students with EBD. The academic achievement measures are based upon California's CORE High School Readiness Index and the Smarter Balanced Assessment Consortium (SBAC), which are shared in the details of the literature review. Finding relationships between the class setting and the academic achievement of middle school students with EBD is important in providing support that renders most effective towards students' success. The study employed quantitative research design and reviewed achievement data from the following school years: 2017-18, 2018-19, 2021-22. There are three research questions and a conceptual framework that guided the literature review and data analysis. The findings suggest that there is a relationship between academic achievement and class settings of student participation. The findings also suggest different academic achievement results, from the measures of the High School Readiness Index, based upon the class settings of student participation. In addition, the findings suggest significant differences for the performance of the SBAC English language arts and math exams based upon students' class settings. Recommendations include providing opportunities for students with EBD to participate in mainstream class settings with proper Individualized Educational Plans supports, professional development for special education and general education teachers to provide coteaching models in a mainstream classroom, and progress monitoring of Individualized Educational Plans support to help students with EBD transition from special day class to mainstream classroom settings. [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://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]