High school students have an average level of self-assessing in all three aspects: emotional capacity, social capacity and learning capacity. The study shows a statistically significant difference in self-assessment of students' general capacity between two schools (inner-city and suburban), self-assessment of general capacity increases by grade level (10, 11 and 12). ). The research results also indicate in three sources affecting the self-assessment of students' ability (the source of personal experience - encouraging encouragement, the origin of physical and emotional state and the origin of learning from the commune). Assembly), the source of self-experience - social encouragement has the most predictive effect on the change in self-assessing of student.