International Journal of Academic Multidisciplinary Research (IJAMR)   Year: 2021 | Volume: 5 | Issue: 8 | Page No.: 23-43 The Impact of Grammatical Skills on English Language Proficiency of Grade 12 SHS Students Alejandro G. Albarico, MAEd Abstract: The ultimate goal of this study was to assess the impact of grammatical skills on the English language proficiency of Grade 12 Senior High School Students. The study utilized the descriptive-correlational research design in which standardized research instruments were the primary tools for gathering data. The respondents of the survey were the 295 Grade 12 General Academic Strand (GAS) students of San Ildefonso National High School. All the data collected were processed using the Statistical Package for Social Sciences (SPSS), and the results of the study were tabulated using the necessary tables. Results of the study revealed that the respondents have fair grammatical skills. Meanwhile, their English language proficiency was found to be at the proficient level. Furthermore, the findings of the study indicated that the grammatical skills of students did not significantly impact their English language proficiency. Therefore, the study accepted the null hypothesis which postulated that the grammatical skills do not have a significant impact on the English language proficiency of Grade 12 Senior High School students. Several intervention strategies were proposed based on the findings of the study.