Abstract. Calculus is one of the main courses for the students of Science, Technology, Engineering and Mathematics (STEM) at tertiary level. Thus, all students who are currently taking this course need to get at least grade C for them to pass the examination. Many educators used to apply tools in their teaching method to make the students understand clearly on the topics given in their syllabus. However, it is very seldom that the effectiveness of the tools being examined. In this paper, the effectiveness of integrating CCMPedia in teaching and learning Calculus 1 is discussed. CCMPedia is an encyclopedia for common calculus mistakes, which was designed by some educators from Universiti Teknologi MARA, Johor branch, Malaysia (UiTMJ). By using experimental method, four classes were divided into control group and experimental group. The questions were designed according to pre-knowledge, basic knowledge and Calculus 1. Data was collected from 88 students and the result was analyzed by mixed design analysis to access the effect of time factors between pre-test and post-test and the group effects between control and experimental groups. CCMPedia is found to be one of the good mechanisms to assist students in learning process, particularly in basic knowledge and Calculus 1.