The aim of the article is to determine efficient educational technologies providing the formation of prospective teachers’ professional competencies during their practical training at school. In the conditions of implementing competence approach into the system of teacher training the issues of prospective teachers’ personality, their teaching skills, and the problem of undergraduates’ professional self-determination are of great importance. The article presents the results of the research where much attention is given to assessment of students’ professional activities and the criteria of this assessment. The research included comparing the results of the students’ self-evaluation and the experts’ evaluation of the students’ competence development level. Students’ practical training at school reveals some problems that can be eliminated by using competency-based methods and technologies. The process of students’ practical training at school presupposes proper planning of the activities, analyzing competencies formation, monitoring students’ learning achievements. The content of the article can be used by school teachers, moderators, university professors supervising students’ practical training at school.