建立一个学生成绩信息的单向链表，信息包括学号、姓名、成绩，学生记录按学号

由小到大顺序排列，要求实现对成绩信息的插入、修改、删除和遍历操作。-Student achievement information to establish a one-way linked list, information including student number, name, score, record student numbers by school

Small to large order, required to achieve the insertion of performance information, modify, delete, and traversal operations.