This study aims to develop a mathematics module on the infinite limit material of algebraic functions to improve critical thinking skills of phase-F students at SMA Muhammadiyah 1 Sleman. The study used the ADDIE development model which includes five stages: Analysis, Design, Development, Implementation, and Evaluation. Data were collected through material and media expert validation questionnaires, student response questionnaires, and pretest and posttest tests. The validation results showed that the module was classified as very valid, with an average score of 71 from material experts and 103 from media experts. The student response questionnaire produced a practicality score of 72.6, indicating that the module was practical to use. The effectiveness test was carried out using the normality test and paired sample t-test using SPSS-25, which showed a significant increase (p <0.05) in student learning outcomes. The average pretest score of 58.22 increased to 84.27 in the posttest, with an n-Gain value of 0.64 which is classified as moderate. This module also improved scores on all indicators of students' critical thinking. Thus, the developed e-module is declared valid, practical, and effective in improving students' conceptual understanding and critical thinking skills

The Baitul Arqam program, held at SMA Muhammadiyah Mlati on March 19-20, 2025, aimed to strengthen Islamic identity and build the moral integrity of the participants. The program involved various educational activities, such as discussions on Muhammadiyah ideology, worship training, forums on Islamic values, and reflective activities. It focused not only on theory but also on spiritual experiences that heightened religious awareness. The program was conducted in three main stages: preparation, implementation, and evaluation. The methods used included lectures, role-playing simulations, and discussions. The results of the implementation showed success in motivating participants to delve deeper into Muhammadiyah values, with high enthusiasm throughout the event. Participants also expressed great benefits in preparing themselves to become better Muhammadiyah cadres. Evaluation was carried out using a non-test approach, encompassing cognitive, affective, and psychomotor aspects. The success of this activity highlights the importance of careful planning and good coordination in supporting the strengthening of character and religious understanding among students. This program is expected to be held regularly to prepare future generations who are more committed to the values of the organization