This action research sought to determine the students’ writing skills before and after using the Project Write On. This exploration also measured the effect of PWO on students’ knowledge in writing. Additionally, the study investigated the challenges encountered by the research participants and their coping mechanisms in addressing the problems they experienced. The study used sequential explanatory research. The research participants consisted of thirty (30) students from the Humanities and Social Sciences (HUMSS) strand of Zamboanga del Sur National High School – Senior High during the school year 2023-2024. The students obtained below-normal scores before the utilization of PWO, but the performance of the students in writing tests significantly improved after the intervention. The drastic shift in students’ writing skills proved the effectiveness of the Project Write On to the students. The participants experienced four (4) major problems or challenges: (1) Insufficient Knowledge on English Grammar (2) Lack of English Vocabulary, (3) Difficulty on Sentence Structure, and (4) Struggle with Spelling. Furthermore, the research participants articulated their four (4) coping mechanisms in handling the challenges encountered in the implementation of Project Write On: (1) Critical Thinking on Grammar Usage (2) Practicing the Language (3) Following the Basic Structure in Writing, and (4) Seeking Assistance from Classmates & Teachers. The findings of this research support the conduct of a learning program to capacitate the students in their writing skills and enhance the pedagogical skills of the Peer Tutors of the school.