Under achiever pupils were found to have low motivation level in learning mathematics. Pupils avoid Trigonometry and consider this topic as tough for them to master. The objective of this research is to measure under achiever motivation level towards Teaching and Learning (T&L) Trigonometry II topic using GeoGebra Learning Module (GLM). This research has used explanatory mixed methods which is survey and interview to answer the research questions. Pupils were exposed to GLM in Trigonometry II topics for a duration of two weeks. Motivation level are measured using questionnaire adapted from Instructional Material Motivational Scale (IMMS). Five pupils then were interviewed by the researcher to gauge pupils motivation towards GLM. Respondents are from 21 under achiever pupils from one intact class in Muar, Johor. Data analysis showed overall pupils’ motivation level are high (M = 4.16, SD = .279). The level of motivation of pupils for each subscale in ascending order is the Confidence (M = 3.92, SD = .268), Relevant (M = 4.07, SD = .357), Attention (M = 4.25, SD = .320), and Satisfaction (M = 4.50, SD = .436). Girls are significantly motivated [t (19) = 2,401, p <0.05, r = 1.07] compared to boys in using GLM. Result from the interviews were found similar to the surveys result. Pupils were found to be attracted to self access learning concept and slider function in the learning process. It is recommended that mathematics teachers should use GeoGebra by developing learning module that combine mathematics dynamic software and written module to help under achiever pupils further improve their motivation in T&L.