Anxiety should be considered as impaired adaptation in a particular situation. It can negatively impact mental health, quality of life, overall well-being, and disrupt schoolchildren's education and development. The study aimed to assess how anxiety levels influence the academic achievement of today’s adolescents using psychodiagnostic tools. The researchers assessed levels of school-related, situational, and personal anxiety among ninth graders in Voronezh using the School Anxiety Test by B.N. Phillips and the Spielberger–Hanin Anxiety Scale, analyzing gender differences and the subsequent impact of anxiety on academic performance. Statistical methods were applied to the test data. The study found that most participating schoolchildren showed a normal level of anxiety. However, girls had higher levels than boys. As for the link between anxiety and academic performance, we did not identify an interconnection that, influenced by certain factors, may have a positive or a negative effect on the education-related productivity of adolescents. The results of this study complement the existing body of knowledge on the issue.