The reason for the difficulty of mathematics in Harbin senior high school entrance examination is the poor teaching quality and insufficient preparation of students.

1, poor teaching quality: Mathematics is a subject that needs to be accumulated and understood. Students' junior high school mathematics foundation is not solid enough, or teachers don't grasp the difficulties and key points in teaching, which will lead students to feel the difficulty of mathematics in the senior high school entrance examination.

2. Insufficient preparation for exams: Preparation for exams is one of the key factors that determine the results of the senior high school entrance examination. Students don't systematically review their math knowledge and skills in the process of preparing for the exam, or they don't do enough exercises and mock exams, which will make the entrance examination more difficult.