This study reported the Effectiveness of Teachers' Feedback and Students' Self-Efficacy Toward Writing Competence In 11th Grade in SMKN 3 Batam. The research aims are: (1) To investigate the effectiveness of implementing teachers'
feedback and Students' Self-Efficacy interventions on students' writing competence in an experimental class, and (2) to compare the improvement of teachers' feedback and Students' Self-Efficacy interventions affect on students' writing competence and determine which approach has the greatest impact on writing skill. The study used a quantitative approach, incorporating a pre-test and post-test design with both an experimental group and a control group. Seventy
students from two classes were selected as participants from a total population of 600 eleventh-grade students across 15 classes at SMKN 3 Batam during the 2024/2025 academic year. The result showed that; l) The effectiveness of integrating teacher feedback and cultivating student self-efficacy in enhancing writing competence within the experimental class is empirically confirmed by the statistically significant increased and 2) The extent to which teachers' feedback and students' self-efficacy interventions improve specific components of students' writing competence is compared to the control class, revealing that the integrated approach significantly enhances not only linguistic accuracy but also students motivation, confidence, and overall writing performance.