### Chinese: 兰州交通大学3名学生给校领导写信，反映对大学考试的困惑，并提出提高考试难度，变换考试题型，让考试真正体现学生实际水平的诉求。
### English: Three students from Lanzhou Jiaotong University wrote letters to the school leaders, reflecting their confusion about the college examination, and put forward the demands of improving the difficulty of the examination, changing the examination questions, and making the examination truly reflect the students' actual level.
### Errors: There is no error in the English translation.

### Improved English: Three students in Lanzhou Jiaotong University wrote a letter to leaders of the university to reflect their confusion on examinations in university, and raised the ideas to increase the difficulty of examinations, change types of questions and let the examinations reflect the real learning level of students.
