The study aims to determine the effectiveness of integrating simulation tools towards the mastery of the Most Essential Learning Competencies in Mathematics of 30 Grade 8 Junior High School Students of Talangan Integrated National High School, Nagcarlan District 2022-2023. The simulation tools used in this study were, Construction tool-MathPad, Geogebra, CK12, and Video Simulation. The competencies include describing a mathematical system, Illustrating the need for an axiomatic structure, illustrating triangle congruence, solving corresponding parts of congruent triangles, and proving two triangles are congruent. The researcher employed the sequential mixed method of research the first method was the experimental method, where the researcher used simulation tools to teach the competencies for six weeks, gathered quantitative data using pre-test and post-test design, then interviewed the students and gathered qualitative data. The results show a significant difference between the pre-test and post-test performance of student respondents exposed to simulation tools. The emerging factors that helped the student-respondents maximize the capacity of mastering the most essential learning competencies are manipulative representation, availability of the defined terms, examples included, teacher factor, and students interests.