The aim of this study is to find out the factors on counsellor's effective skills towards the effects obtained through students' career guidance. Data from Secondary High School Department (DIKMEN) were analysed to investigate the mediation effect of counsellors' counselling skills to career guidance by applying SPSS 18.0. There was continual increase of self-efficacy regarding to students' satisfaction with the skilled career guidance counsellors. This study investigated the long-term stability of the positive effects obtained quantitatively done by the counsellors with improved effective counselling skills on students' career guidance. The result of the study showed that there are seven factors which become the key factors to effective counseling skill to improve the effective counseling skill and the effectiveness of individual counseling namely; attending, leading, reflecting, summarizing, interpreting, confronting, and informing/ advising. By acquiring those seven skills, the counselors contributed significantly to improve the effectiveness of individual counseling towards career guidance.