This research study examined the difference of traditional and blended instruction regarding student achievement. Specifically, this study concentrates on the academic performance data in grades 10th-11th, analyzing the interaction regarding gender and attendance of the students within an alternative school program. Further, the South Carolina End-of-Course Examination Program (EOCEP) was administered to students between 2016 and 2020, and that data was used to conduct this study. The following examination scores are analyzed, comparing the effectiveness of traditional and blended curricula on standardized test scores in Biology and U.S. History. A consensus is well-known among educational researchers emphasizing the need for additional research on blended instructional practices in K-12 and alternative schools. The methodology used in this study compares traditional and blended curricula. This research study examined the effectiveness of curricula in an alternative school environment by analyzing academic achievement on standardized tests and its interactions with gender and chronic absenteeism. The study was analyzed using descriptive statistics, frequency tables, and graphs. Descriptive Statistics was used to translate the following data: number of schools, gender, and chronic absenteeism. Conclusively, a more specific evaluation of each null hypothesis and its findings was examined using the independent t-test, two-way ANOVA, and other appropriate statistical tools. The findings in this study show no significant difference in academic achievement regarding the use of traditional and blended curricula. Furthermore, the study showed no interaction between traditional and blended curricula regarding gender and chronic absenteeism. [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.]