diff --git a/src/main/java/me/lensfrex/manager/data/ManagerTool.java b/src/main/java/me/lensfrex/manager/data/manager/ManagerTool.java
similarity index 78%
rename from src/main/java/me/lensfrex/manager/data/ManagerTool.java
rename to src/main/java/me/lensfrex/manager/data/manager/ManagerTool.java
index 44e43c4..7e65ad6 100644
--- a/src/main/java/me/lensfrex/manager/data/ManagerTool.java
+++ b/src/main/java/me/lensfrex/manager/data/manager/ManagerTool.java
@@ -1,4 +1,6 @@
-package me.lensfrex.manager.data;
+package me.lensfrex.manager.data.manager;
+
+import me.lensfrex.manager.data.Student;
 
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -10,7 +12,7 @@ import java.util.Map;
 public class ManagerTool {
     private final ArrayList<Student> students;
 
-    public ManagerTool(ArrayList<Student> studentData) {
+    protected ManagerTool(ArrayList<Student> studentData) {
         this.students = studentData;
     }
 
@@ -21,7 +23,7 @@ public class ManagerTool {
      * @param name  学生姓名
      * @param score 学生成绩，map中key为科目名称，value为相应的成绩
      */
-    public void addStudent(long id, String name, Map<String, Integer> score) {
+    protected void addStudent(long id, String name, Map<String, Integer> score) {
         Student student = new Student(id, name, score);
         students.add(student);
     }
@@ -31,7 +33,7 @@ public class ManagerTool {
      *
      * @param id 学生id，long格式
      */
-    public void removeStudent(long id) {
+    protected void removeStudent(long id) {
         students.remove(getStudent(id));
     }
 
@@ -40,7 +42,7 @@ public class ManagerTool {
      *
      * @param name 学生姓名，long格式
      */
-    public void removeStudent(String name) {
+    protected void removeStudent(String name) {
         students.remove(getStudent(name));
     }
 
@@ -50,7 +52,7 @@ public class ManagerTool {
      * @param name 学生姓名
      * @return 学生的信息，若无该学生则返回null
      */
-    public Student getStudent(String name) {
+    protected Student getStudent(String name) {
         for (Student student : students) {
             if (student.getName().equals(name)) {
                 return student;
@@ -65,7 +67,7 @@ public class ManagerTool {
      * @param id 学生学号
      * @return 学生信息，若无该学生则返回null
      */
-    public Student getStudent(long id) {
+    protected Student getStudent(long id) {
         for (Student student : students) {
             if (student.getId() == id) {
                 return student;
@@ -74,9 +76,9 @@ public class ManagerTool {
         return null;
     }
 
-    public static final int SORT_COMPARE_BY_NAME = 0;
-    public static final int SORT_COMPARE_BY_ID = 1;
-    public static final int SORT_COMPARE_BY_GENERAL_SCORE = 2;
+    protected static final int SORT_COMPARE_BY_NAME = 0;
+    protected static final int SORT_COMPARE_BY_ID = 1;
+    protected static final int SORT_COMPARE_BY_GENERAL_SCORE = 2;
 
     /**
      * 对学生列表进行排序
@@ -85,7 +87,7 @@ public class ManagerTool {
      *                      可根据名字字典顺序（升序，0）、学生学号（升序，1）以及总成绩（降序，2）进行排序。
      * @return 排序后的学生列表
      */
-    public ArrayList<Student> getSortedStudentList(int compareMethod) {
+    protected ArrayList<Student> getSortedStudentList(int compareMethod) {
         switch (compareMethod) {
             case SORT_COMPARE_BY_NAME:
                 students.sort(Student.compareByName);
@@ -108,7 +110,7 @@ public class ManagerTool {
      * @param subject 欲获取的科目信息
      * @return 包含成绩信息的HashMap，key为学生姓名，value为该科成绩数据
      */
-    public HashMap<String, Integer> getSubjectScores(String subject) {
+    protected HashMap<String, Integer> getSubjectScores(String subject) {
         HashMap<String, Integer> scores = new HashMap<>();
         for (Student student : students) {
             scores.put(student.getName(), student.getScore().get(subject));
@@ -121,7 +123,7 @@ public class ManagerTool {
      *
      * @return 包含全班所有同学成绩的HashMap，key为姓名，value为总成绩数据
      */
-    public HashMap<String, Integer> getAllStudentScores() {
+    protected HashMap<String, Integer> getAllStudentScores() {
         HashMap<String, Integer> result = new HashMap<>();
 
         int scoreSum = 0;
@@ -140,7 +142,7 @@ public class ManagerTool {
      *
      * @return 包含有排名信息的HashMap，key为姓名，value为相应的排名
      */
-    public HashMap<String, Integer> generateRanking() {
+    protected HashMap<String, Integer> generateRanking() {
         HashMap<String, Integer> ranking = new HashMap<>();
         this.getSortedStudentList(SORT_COMPARE_BY_GENERAL_SCORE);
 
@@ -156,7 +158,7 @@ public class ManagerTool {
      *
      * @return 包含所有科目名称的Arraylist，若无学生信息则返回null
      */
-    public ArrayList<String> getAllSubjects() {
+    protected ArrayList<String> getAllSubjects() {
         if (students.isEmpty()) {
             return null;
         }
@@ -168,7 +170,7 @@ public class ManagerTool {
      *
      * @return 学生总人数
      */
-    public int getStudentAmount() {
+    protected int getStudentAmount() {
         return students.size();
     }
 
diff --git a/src/main/java/me/lensfrex/manager/data/StudentManager.java b/src/main/java/me/lensfrex/manager/data/manager/StudentManager.java
similarity index 79%
rename from src/main/java/me/lensfrex/manager/data/StudentManager.java
rename to src/main/java/me/lensfrex/manager/data/manager/StudentManager.java
index 9b50ff4..35c47b9 100644
--- a/src/main/java/me/lensfrex/manager/data/StudentManager.java
+++ b/src/main/java/me/lensfrex/manager/data/manager/StudentManager.java
@@ -1,4 +1,6 @@
-package me.lensfrex.manager.data;
+package me.lensfrex.manager.data.manager;
+
+import me.lensfrex.manager.data.Student;
 
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -79,7 +81,7 @@ public class StudentManager {
         return scores;
     }
 
-    /**-
+    /**
      * 获取每门科目的平均成绩
      *
      * @return 包含每门课总成绩的HashMap，key为科目名称，value为该科目的平均成绩
@@ -95,6 +97,14 @@ public class StudentManager {
         return scores;
     }
 
+    /**
+     *  获取所有科目
+     * @return 包含有科目名称的ArrayList
+     */
+    public ArrayList<String> getSubjects() {
+        return managerTool.getAllSubjects();
+    }
+
     /**
      * 按学生总分由高到低生成名次表
      *
@@ -115,7 +125,6 @@ public class StudentManager {
         return stringBuilder.toString();
     }
 
-
     /**
      * 按学生学号由小到大生成成绩表
      *
@@ -123,21 +132,14 @@ public class StudentManager {
      */
     public String generateScoreTableById() {
         StringBuilder stringBuilder = new StringBuilder("ID  |  Name  |  General Score  |  Subject1: score Subject2: score ...\n");
-        ArrayList<Student> sortStudentList = managerTool.getSortedStudentList(ManagerTool.SORT_COMPARE_BY_GENERAL_SCORE);
-        ArrayList<String> subjects = managerTool.getAllSubjects();
+        ArrayList<Student> sortStudentList = managerTool.getSortedStudentList(ManagerTool.SORT_COMPARE_BY_ID);
 
         for (Student student : sortStudentList) {
             stringBuilder
                     .append(student.getId()).append("  |  ")
                     .append(student.getName()).append("  |  ")
-                    .append(student.getGeneralScore()).append("  |  ");
-            for (String subject : subjects) {
-                stringBuilder
-                        .append(subject).append(": ")
-                        .append(student.getScore().get(subject)).append(' ');
-            }
-
-            stringBuilder.append('\n');
+                    .append(student.getGeneralScore()).append("  |  ")
+                    .append(listScore(student)).append('\n');
         }
 
         return stringBuilder.toString();
@@ -149,25 +151,36 @@ public class StudentManager {
      * @return 成绩表字符串
      */
     public String generateScoreTableByName() {
-        StringBuilder stringBuilder = new StringBuilder("Name  |  Id  |  General Score  |  Subject1/score Subject2: score ...\n");
-        ArrayList<Student> sortStudentList = managerTool.getSortedStudentList(ManagerTool.SORT_COMPARE_BY_GENERAL_SCORE);
-        ArrayList<String> subjects = managerTool.getAllSubjects();
+        StringBuilder stringBuilder = new StringBuilder("Name  |  Id  |  General Score  |  Subject1: score Subject2: score ...\n");
+        ArrayList<Student> sortStudentList = managerTool.getSortedStudentList(ManagerTool.SORT_COMPARE_BY_NAME);
 
         for (Student student : sortStudentList) {
             stringBuilder
                     .append(student.getName()).append("  |  ")
                     .append(student.getId()).append("  |  ")
-                    .append(student.getGeneralScore()).append("  |  ");
-            for (String subject : subjects) {
-                stringBuilder
-                        .append(subject).append(": ")
-                        .append(student.getScore().get(subject)).append(' ');
-            }
-
-            stringBuilder.append('\n');
+                    .append(student.getGeneralScore()).append("  |  ")
+                    .append(listScore(student)).append('\n');
         }
 
         return stringBuilder.toString();
     }
 
+    /**
+     * 列出某一学生的成绩
+     *
+     * @param student 学生
+     * @return 成绩字符串
+     */
+    private String listScore(Student student) {
+        StringBuilder stringBuilder = new StringBuilder();
+        ArrayList<String> subjects = managerTool.getAllSubjects();
+
+        for (String subject : subjects) {
+            stringBuilder
+                    .append(subject).append(": ")
+                    .append(student.getScore().get(subject)).append(' ');
+        }
+        return stringBuilder.toString();
+    }
+
 }