Basic Calculus is one of the most significant topics in pure mathematics, and students commonly fail to grasp its concepts. Thus, the development of teaching materials in Basic Calculus is essential to enhance the performance of the students to make learning more interactive. This study evaluated the learning skills of Grade 12 STEM students at Ilocos Sur Polytechnic State College in Basic Calculus particularly in Differentiation part, which led to the creation of a Developed Instructional Material. It made use of the descriptive research design involving correlational and developmental methods with a two-part questionnaire as the data gathering tool. The 36 student-respondents were chosen using the total enumeration technique. Weighted mean and Spearman correlation were utilized to analyze the data. According to the findings, the respondents' level of technology-assisted resources at home is relatively low. In addition, in terms of content, style, and instructions, the developed instructional material in Basic Calculus has a Very Acceptable degree of acceptability. Furthermore, the adequacy of technology-assisted resources had no effect on the level of acceptability of the developed instructional material in terms of content and style. Only the studentrespondents' level of acceptability of instructions, on the other hand, showed a positive correlation. Finally, the developed instructional material is deemed to be very valid. The developed instructional material in basic Calculus may be used as an instructional material and that further studies can be conducted to continuously explore possible pedagogical interventions.

Keywords : Developed Instructional Material, TechnologyAssisted Resources, Acceptability of Instructional Material, Validated Material.