The present study investigated the effectiveness of an equity-based inclusive school reform model nested within a multitiered system of support (MTSS) framework on the improvement of math and reading performance of students with Individualized Education Programs (IEPs). Descriptive statistics revealed that math state assessment scores of students with IEPs increased over the implementation period. Results of multilevel modeling demonstrated that the model's fidelity of implementation scores positively and significantly predicted state assessment math scores. A further analysis examining the effectiveness of the model in three schools that implemented with adequate fidelity compared with nonimplementing schools indicated students with IEPs in implementing schools increased their math scores at a greater rate than their peers in comparison schools; however, effects on reading scores were equivocal. Findings are discussed in the context of inclusion and efforts to support high fidelity implementation of MTSS.