The placement examination of Xishan Senior Middle School in Jiangsu Province refers to the fact that in order to better organize students, the school divides them into different classes for study and education according to their learning level, grades and interests. This can better meet the learning needs of students and provide more targeted teaching. The reasons for the placement examination in Xishan Senior Middle School in Jiangsu Province are as follows:

1. Teaching adaptability: Different students have differences in learning ability, subject interest and subject level. Through the placement examination, the school can classify students according to their respective academic level and interests, which makes the teaching more targeted and better meets the learning needs of students.

2. Balanced class quality: Placement examination can help schools ensure a relatively balanced level of students in each class, avoid the situation that some classes are too strong or weak, and help improve the teaching quality of the whole school and the overall quality of students.

3. Promote competition and progress: Students' competition in placement exams can stimulate students' learning enthusiasm and initiative, and urge them to strive to improve their learning level and achieve self-progress.

4. Individualized development: Placement examination is conducive to meeting students' individualized learning needs and development direction, so that each student can fully develop and exert his potential in an environment suitable for him.