Conclusion
Based on the results of the present study, it can be concluded that educating students on life skills such as problem-solving and assertiveness skill in school, in addition to teaching routine lessons, can be highly effective in their self esteem and mental health improvement. All self-esteem subscales such as general self, home parents, social self-peers and school academic have improved after the intervention. The subscales of the mental health variables also showed significant changes. It seems that students need to learn more life skills in school in order to promote empowerment and become more capable in personal and social life. Thus, it is safe to say that training life skills is one the basic needs for children which should be considered in addition to conventional education in schools.