This study focuses on the design of English instructional materials for EFL (English as a Foreign Language) junior high school students, based on the existing school curriculum in Indonesia. The study aims to address the challenges faced by students in mastering the English language due to limited classroom exposure and the inadequacies of current teaching materials, which often do not align with the curriculum requirements.The research employs a developmental approach, which includes need analysis, design, development, implementation, and evaluation of the instructional materials. Through this process, the study seeks to create materials that are not only effective in enhancing students' English proficiency but also well-received by both teachers and students. The findings indicate that instructional materials developed in alignment with the school curriculum, and utilizing a combination of presentation, practice, and production methods, significantly improve the English language achievement of students. Both teachers and students responded positively to the materials, recognizing their effectiveness in the learning process.