ABSTRACT
The purpose of this single-subject quasi-experimental study is to determine the effect of using mobile GeoGebra on the performance of G11 students on specific learning competencies in Precalculus. The respondents were chosen through purposive sampling and consisted of 31 students under the homogenous section of the Science, Technology, Engineering, and Mathematics (STEM) strand of Batanes National Science High School (BNSHS). A pretest was given to the respondents before the intervention was introduced. Worksheets that contained graphing exercises were provided to the respondents as homework to complement the minimal time allotted for the subject. A posttest was administered after the five-week data-gathering period. Data analysis showed that the difference between the pretest and posttest means was significant. The use of GeoGebra enhanced the students' performance in graphing conic sections.