GRACE Workbook: Its Effect on Grammatical Competence and Reading Comprehension of Grade 7 Students

This study investigated the effect of the GRACE Workbook on the grammatical competence and reading comprehension of the Grade 7 students in Northern Canaman High School, Canaman District, Canaman, Camarines Sur, during the School Year 2024–2025. Specifically, it measured learners’ competence in subject-verb agreement and sentence errors, their status in literal, inferential, and critical comprehension, and evaluated the effectiveness of the developed workbook using the ADDIE model. The study employed descriptive-comparative and research and development (R&D) methods. Researcher-made tests and evaluation checklists were utilized, and data were analyzed using mean, weighted mean, performance level matrix, standard deviation, paired t-test, Cohen’s d, and ADDIE Model. The respondents were the with 62 Grade 7 learners and 10 English teacher-experts. The study concluded that before using the Grammatical Competence and Reading Comprehension Enhancement Workbook, the Grade 7 learners’ performance in both subject-verb agreement and sentence errors was categorized as Developing. Likewise, their performance in literal, inferential, and critical comprehension was also at the Developing level. The workbook, which was designed and validated through the ADDIE model, was found to be Highly Valid in terms of its overall design. After its implementation, the learners’ grammatical competence and reading comprehension improved to Approaching Proficiency (AP). Statistical analysis showed a significant difference between initial and final performance, leading to rejection of the null hypothesis. Large effect sizes for grammar and reading confirmed the workbook’s effectiveness in enhancing learners’ skills.