21st Century Learning is a student-centered learning process that has been introduced in Malaysia since 2014. This study aims to integrate the 4C elements, which are collaboration, communication, creativity, and critical thinking in the interventions to improve English writing skill among 3K class students. Also, the study was conducted to determine how peer guidance can help 3K class students, who were weak in writing, to improve their English writing skills. The action research was carried out based on Kurt Lewin's Model. The research instruments involved were pre-test, post-test, and semi-structured interview. A total of 32 students sat for both pre-test and post-test before and after the interventions. A semi-structured interview consisting of five questions was conducted after the student completed the post-test. Descriptive statistics involving mean and percentage scores were used to analyze pre-test and post-test findings, while the interview findings were summarized. The results showed that there was an improvement in their English writing skills, where the mean score for the pre-test was 19.34, while the mean score for post-test was 22.66. The findings indicate that weaker students agreed that guidance of students who possess better writing skills helped them improve their English writing skills. The results of the pre-test and post-test showed that the intervention conducted has successfully helped 3K class students to improve their English writing skills.