ISSN: 2782-893X
eISSN: 2799-0664
ISSN: 2782- 893X
—— Strategic Intervention Materials (SIM) is one of the learning materials or tools used by teachers in improving the mastery levels of the students in Math, Science, English, and other learning areas. Most of the Mathematics teachers crafted the SIM and used by the students during the conduct of remedial, reinforcement and enrichment activities after every Math lesson. The purpose of which is for the students to master the skills taught for the day and improve their performance of the subject. Being a math teacher in senior high school, the researcher used the materials for several years especially before the pandemic. Having students who have difficulty in understanding Math lessons, the researcher tried to utilize the SIM in the classroom hoping that same result will be achieved. Utilizing the researcher-made test questions conducted before and after the utilization of the materials, while employing a quasi-experimental research design, it is hoped that the performance of the students will improve. Simple percentage and t-test of mean difference were the statistical tools used to interpret the result of the study. After giving the pretest and post-test and utilizing the SIM crafted based on the least learned skills, the study revealed a significant difference in the performance of Grade 11 senior high school students in Math. Positive learning outcomes are attained by the students for the materials used as intervention is suited to their needs, it is interactive and provide simple concepts which can be understood by all the students, and the activities which are from simple to complex making it an effective tool or learning materials to be used in the teaching-learning process and in achieving mastery of the least mastered skills. Keywords — Effectiveness, Strategic Intervention Materials (SIM), Performance, Grade 11 Students