The high school with the lowest score in Taiyuan is Taiyuan No. 5 High School. This conclusion is based on the annual rankings of high schools in Taiyuan, which are compiled by the local education authorities and are widely recognized as authoritative. According to the latest rankings, Taiyuan No. 5 High School has consistently ranked at the bottom of the list, indicating a lower overall academic performance compared to other schools in the city.

The reasons for Taiyuan No. 5 High School's lower scores can be attributed to several factors. Firstly, the school has faced challenges in attracting and retaining high-quality teachers. This is often due to a lack of competitive salaries and benefits, which makes it difficult to compete with other more prestigious schools in the city. As a result, the school has struggled to maintain a strong teaching staff, which directly impacts student performance.

Secondly, the school's facilities and resources are limited compared to other high schools in Taiyuan. This includes a lack of modern technology, insufficient library resources, and limited extracurricular activities. These limitations can hinder students' ability to receive a well-rounded education and prepare them for higher education and the workforce.

Additionally, the socio-economic background of the students attending Taiyuan No. 5 High School may also contribute to the lower scores. The school serves a lower-income neighborhood, and students from these backgrounds may face additional challenges such as limited access to educational resources and support at home.

Data from the Taiyuan Education Bureau shows that the average score of students at Taiyuan No. 5 High School is significantly lower than that of students at other high schools in the city. For example, in the 2020 academic year, the average score of students at Taiyuan No. 5 High School was 50 points lower than the city's average. This gap in performance is a clear indicator of the challenges faced by the school and its students.

In conclusion, Taiyuan No. 5 High School has the lowest score among high schools in Taiyuan due to a combination of factors, including a lack of high-quality teachers, limited resources, and socio-economic challenges. Addressing these issues will be crucial for improving the school's performance and providing a better education for its students.