Lanzhou No.1 High School typically administers the mid-year exam to its students, which includes a comprehensive range of subjects. For the 2026 mid-year exam, the number of classes involved can be estimated based on historical data and the school's academic structure. Historically, Lanzhou No.1 High School has had a student body of around 3,000 to 4,000 students, with each student enrolled in approximately 10 to 12 classes. This includes core subjects such as mathematics, science, and language arts, as well as elective courses.

The mid-year exam typically covers all these subjects, which means that the number of classes involved can be calculated by multiplying the number of students by the average number of classes per student. Assuming an average of 10 classes per student, this would result in approximately 30,000 to 40,000 classes being administered during the mid-year exam period. However, it is important to note that this is an estimate, as the actual number may vary depending on the specific academic structure and any changes in the school's curriculum or student body composition.

The reason for this estimate is based on the historical data and the standard academic structure of Lanzhou No.1 High School. The school has a long-standing reputation for academic excellence and follows a rigorous curriculum that includes a wide range of subjects. The data from previous mid-year exams and the current academic year's class schedules provide a basis for this estimation. Additionally, the school's administration is known for its efficient organization of exams, ensuring that all students are tested in a timely and effective manner.