This study was conducted to describe the experiences of the Science teachers teaching Biology in utilizing the Strategic Intervention Material (SIM) and to find out if there was a significant increase in the academic performance of the students using the SIM in Kabasalan National High School, Division of Zamboanga Sibugay, within the academic year 2022-2023. SIM is a tool for remediation and a strategy to deepen the students learning. The researcher used interviews and observational procedures to gather information. For the interview, the type of interview procedure the researcher employed was an interview guide approach. There were key questions asked of the participants, though. These key questions were identified, and follow-up questions were asked to further probe the responses of the teachers. For the observational procedure, the researcher used the observer-as-participant approach. The participant-observer took on the role of observer much more than the role of participant. This study found that SIM enhances students’ interest as well as their retention of the lesson. Based on the data gathered, four (4) themes emerged: SIM as supplemental learning material, SIM as an intervention, SIM as quality assurance, and SIM as academic performance enhancement. The researcher used the pretest and post-test to determine the student’s academic performance enhancement and analyzed the results using the paired-sample t-test. The results showed that there was a significant increase in the student’s performance from the pretest to the posttest. The SIM was deemed beneficial in upgrading students’ learning of the subject’s content and increasing their academic performance.

Keywords: strategic intervention material, supplementary learning material, intervention, quality assurance, academic performance enhancement