Strategic Intervention Material (SIM) is a type of instructional material that is designed to be targeted and effective for students who are struggling with a particular concept or skill. SIM typically includes a variety of activities and resources that are designed to help students learn and master the material. This study investigated the effectiveness of Strategic Intervention Material (SIM) in improving the academic achievement of grade 11 students in distinguishing stocks and bonds. A quasi-experimental design with a non-equivalent control group pretest-posttest design was used. Sixty-four (64) participants were selected as subjects of the study. Mean and t-tests were used as tools in the analysis of data. The results revealed that SIM significantly improved the academic achievement of students in distinguishing stocks and bonds. The experimental group achieved a significantly higher mean score on the posttest than the control group. Additionally, the experimental group achieved a better gain score than the control group. This study suggests that SIM is an effective instructional strategy for improving student achievement in distinguishing stocks and bonds. Further research is needed to investigate the effectiveness of SIM in other subjects and with other student populations.