The article deals with psychological and pedagogical garantees and methodical aspects of high school students' training for the final test on the example of Natural Sciences school subject. The attention is focused on the possibilities of students' individually-personal maintenance and support in preparing for the State Exam; on forming the equal participation of students and training in the organization and implementation of their joint activity. The methodical and psycho-pedagogical principles of training for the State Exam are suggested in the article.