diff --git a/src/main/java/io/zipcoder/Classroom.java b/src/main/java/io/zipcoder/Classroom.java
index 64566f0..59232c2 100644
--- a/src/main/java/io/zipcoder/Classroom.java
+++ b/src/main/java/io/zipcoder/Classroom.java
@@ -1,4 +1,85 @@
 package io.zipcoder;
 
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Map;
+import java.util.TreeMap;
+
 public class Classroom {
+    Student[] students;
+    int maxNumberOfStudents;
+
+    public Classroom(int maxNumberOfStudent){
+        maxNumberOfStudents = maxNumberOfStudent;
+    }
+    public Classroom(Student[] allStudents){
+        this.students = allStudents;
+    }
+    public Classroom(){
+        this.students = new Student[30];
+    }
+    public Student[] getStudents() {
+        return students;
+    }
+    public Double getAverageExamScore(){
+        Double examSum = 0.0;
+        for(int i = 0; i < students.length; i++){
+            examSum += students[i].getAverageExamScore();
+        }
+        return examSum/students.length;
+    }
+    public void addStudent(Student student){
+        students = new Student[maxNumberOfStudents];
+        for (int i = 0; i < this.students.length; i++){
+            if(this.students[i] == null){
+                students[i] = student;
+                break;
+            }
+        }
+    }
+    public void removeStudent(String firstName, String lastName) {
+        for (int i = 0; i < students.length; i++) {
+            if ((students[i].firstName + students[i].lastName).equals(firstName + lastName)) {
+                System.arraycopy(students, i + 1, students, i, students.length - 1 - i);
+            }
+            students[students.length - 1] = null;
+            break;
+        }
+    }
+        public Student[] getStudentsByScore () {
+            Student[] scoreArr = new Student[students.length];
+            for (int i=0 ; i <students.length-1; i ++) {
+                for (int j = i + 1; j < students.length; j++) {
+                    if (students[i].getAverageExamScore().compareTo(students[j].getAverageExamScore()) < 0) {
+                        Student temp = students[i];
+                        students[i] = students[j];
+                        students[j] = temp;
+                    }
+                }
+            }
+            return scoreArr;
+    }
+
+    public Map getGradeBook() {
+        Map<String, String> gradeBook = new TreeMap<String, String>();
+        for (int i = 0; i < students.length; i++) {
+            if (students[i].getAverageExamScore() >= 90) {
+                gradeBook.put(students[i].getFirstName(), "A");
+            } else if (students[i].getAverageExamScore() >= 80) {
+                gradeBook.put(students[i].getFirstName(), "B");
+            } else if (students[i].getAverageExamScore() >= 70) {
+                gradeBook.put(students[i].getFirstName(), "C");
+            } else if (students[i].getAverageExamScore() >= 60) {
+                gradeBook.put(students[i].getFirstName(), "D");
+            } else {
+                gradeBook.put(students[i].getFirstName(), "F");
+            }
+
+        }
+        for (Map.Entry g : gradeBook.entrySet()) {
+            System.out.println(g);
+        }
+        return gradeBook;
+    }
 }
diff --git a/src/main/java/io/zipcoder/Student.java b/src/main/java/io/zipcoder/Student.java
index b543e36..48bce97 100644
--- a/src/main/java/io/zipcoder/Student.java
+++ b/src/main/java/io/zipcoder/Student.java
@@ -1,4 +1,63 @@
 package io.zipcoder;
 
+import java.util.ArrayList;
+import java.util.Arrays;
+
 public class Student {
+    String firstName;
+    String lastName;
+    ArrayList<Double> examScores;
+
+    public Student(String firstName, String lastName, ArrayList<Double> examScores) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+        this.examScores = examScores;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public String getExamScores(){
+        String output = "Exam Scores:\n";
+        int counter = 1;
+        for(int i = 0; i <= examScores.size() - 1; i++){
+            output +=" \tExam " + counter + " -> " + examScores.get(i) + "\n";
+            counter++;
+        }
+        return output;
+    }
+
+    public int getNumberOfExamsTaken() {
+        return examScores.size();
+    }
+
+    public void addExamScore(Double score){ examScores.add(score); }
+
+    public void setExamScores(int examNumber, double newScore) { examScores.set(examNumber, newScore); }
+
+    public Double getAverageExamScore(){
+        Double average = 0.0;
+        for(int i = 0; i < examScores.size(); i++){
+            average += examScores.get(i);
+        }
+        return average/examScores.size();
+    }
+
+    @Override
+    public String toString(){
+        return "Student: " + getFirstName() + getLastName() + ", Average Scores: " + getAverageExamScore() + getExamScores();
+    }
 }
diff --git a/src/test/java/io/zipcoder/ClassroomTest.java b/src/test/java/io/zipcoder/ClassroomTest.java
index 7bac1ff..70eaff2 100644
--- a/src/test/java/io/zipcoder/ClassroomTest.java
+++ b/src/test/java/io/zipcoder/ClassroomTest.java
@@ -1,4 +1,94 @@
 package io.zipcoder;
 
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Map;
+
+
 public class ClassroomTest {
+    @Test
+    public void testGetAvergeExamScore() {
+        ArrayList<Double> s1Scores = new ArrayList<Double>(Arrays.asList(84.00, 92.00));
+        ArrayList<Double> s2Scores = new ArrayList<Double>(Arrays.asList(96.0, 100.00));
+
+        Student s1 = new Student("Kai", "Shields", s1Scores);
+        Student s2 = new Student("Kendra", "Ng", s2Scores);
+
+        Double expectedAverage = 93.0;
+        Student[] students = {s1, s2};
+        Classroom classroom = new Classroom(students);
+
+        Double actual = classroom.getAverageExamScore();
+
+        Assert.assertEquals(expectedAverage, actual);
+    }
+
+    @Test
+    public void testAddStudent() {
+        int maxNumberOfStudents = 1;
+        Classroom classroom = new Classroom(maxNumberOfStudents);
+        ArrayList<Double> examScores = new ArrayList<>(Arrays.asList(100.0, 85.0, 76.0, 0.0));
+        Student student = new Student("Kai", "Shields", examScores);
+
+        Student[] preEnrollment = classroom.getStudents();
+        classroom.addStudent(student);
+        Student[] postEnrollment = classroom.getStudents();
+
+        String preEnrollmentAsString = Arrays.toString(preEnrollment);
+        String postEnrollmentAsString = Arrays.toString(postEnrollment);
+    }
+
+    @Test
+    public void testRemoveStudent() {
+        Integer maxNumberOfStudents = 1;
+        Classroom classroom = new Classroom(maxNumberOfStudents);
+        ArrayList<Double> s2Scores = new ArrayList<>(Arrays.asList(89.0, 100.0, 50.0));
+        Student s1 = new Student("Kai", "Shields", s2Scores);
+        classroom.addStudent(s1);
+
+        Integer actual = classroom.getStudents().length;
+
+        classroom.removeStudent("Kai", "Shields");
+
+        Assert.assertEquals(maxNumberOfStudents, actual);
+    }
+
+    @Test
+    public void testGetStudentsByScore() {
+        ArrayList<Double> s1Scores = new ArrayList<Double>(Arrays.asList(100.0, 93.0));
+        ArrayList<Double> s2Scores = new ArrayList<Double>(Arrays.asList(78.0, 85.0));
+        Student s1 = new Student("Kendra", "Ng", s2Scores);
+        Student s2 = new Student("Kai", "Shields", s1Scores);
+        Student[] students = {s1, s2};
+        Classroom classroom = new Classroom(students);
+        classroom.addStudent(s1);
+        classroom.addStudent(s2);
+
+        Student[] preEnrollment = classroom.getStudents();
+        String preEnrollmentAsString = Arrays.toString(preEnrollment);
+        classroom.getStudentsByScore();
+        Student[] postEnrollment = classroom.getStudents();
+
+        String postEnrollmentAsString = Arrays.toString(postEnrollment);
+    }
+
+    @Test
+    public void testGetGradeBook() {
+        ArrayList<Double> s1Scores = new ArrayList<Double>(Arrays.asList(70.0, 100.0));
+        ArrayList<Double> s2Scores = new ArrayList<Double>(Arrays.asList(94.0, 85.0));
+        ArrayList<Double> s3Scores = new ArrayList<Double>(Arrays.asList(62.0, 96.0));
+
+        Student s1 = new Student("Kai", "Shields", s1Scores);
+        Student s2 = new Student("Kendra", "Ng", s2Scores);
+        Student s3 = new Student("Val", "Fraiger", s3Scores);
+
+        Student[] students = {s1, s2, s3};
+        Classroom classroom = new Classroom(students);
+
+        Map gradeBook = classroom.getGradeBook();
+    }
+
 }
diff --git a/src/test/java/io/zipcoder/StudentTest.java b/src/test/java/io/zipcoder/StudentTest.java
index a9fedec..499437e 100644
--- a/src/test/java/io/zipcoder/StudentTest.java
+++ b/src/test/java/io/zipcoder/StudentTest.java
@@ -1,5 +1,108 @@
 package io.zipcoder;
 
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.concurrent.atomic.AtomicReferenceArray;
+
 public class StudentTest {
+    @Test
+    public void testGetFirstName(){
+        Student s = new Student("Bob", "Bobert", null);
+        String expected = "Bob";
+        String actual = s.getFirstName();
+        Assert.assertEquals(expected, actual);
+    }
+    @Test
+    public void testGetLastName(){
+        Student s = new Student("Bob", "Bobert", null);
+        String expected = "Bobert";
+        String actual = s.getLastName();
+        Assert.assertEquals(expected, actual);
+    }
+    @Test
+    public void testGetExamScores(){
+        String firstName = "Kai";
+        String lastName = "Shields";
+        ArrayList<Double> examScores = new ArrayList<Double>(Arrays.asList(80.0, 87.0, 100.0));
+        Student s = new Student(firstName, lastName, examScores);
+
+        String expected ="Exam Scores:\n" +
+                " \tExam 1 -> 80.0\n" +
+                " \tExam 2 -> 87.0\n" +
+                " \tExam 3 -> 100.0\n";
+        String actual = s.getExamScores();
+
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void testAddExamScore(){
+        String firstName = "Kai";
+        String lastName = "Shields";
+        ArrayList<Double> examScores = new ArrayList<Double>(Arrays.asList(80.0, 87.0, 100.0));
+        Student student = new Student(firstName, lastName, examScores);
+        String expected ="Exam Scores:\n" +
+                " \tExam 1 -> 80.0\n" +
+                " \tExam 2 -> 87.0\n" +
+                " \tExam 3 -> 100.0\n" +
+                " \tExam 4 -> 90.0\n";
+
+        student.addExamScore(90.0);
+        String actual = student.getExamScores();
+
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void testSetExamScore(){
+        String firstName = "Kai";
+        String lastName = "Shields";
+        ArrayList<Double> examScores = new ArrayList<Double>(Arrays.asList(80.0, 87.0, 100.0, 90.0));
+        Student student = new Student(firstName, lastName, examScores);
+        String expected ="Exam Scores:\n" +
+                " \tExam 1 -> 70.0\n" +
+                " \tExam 2 -> 87.0\n" +
+                " \tExam 3 -> 100.0\n" +
+                " \tExam 4 -> 90.0\n";
+
+        student.setExamScores(0, 70.0);
+        String actual = student.getExamScores();
+
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void testAverageExamScore(){
+        String firstName = "Kai";
+        String lastName = "Shields";
+        ArrayList<Double> examScores = new ArrayList<Double>(Arrays.asList(80.0, 87.0, 100.0, 90.0));
+        Student student = new Student(firstName, lastName, examScores);
+        Double expected = 89.25;
+
+        Double actual = student.getAverageExamScore();
+
+        Assert.assertEquals(expected, actual);
+
+    }
+
+    @Test
+    public void testToString(){
+        String firstName = "Kai";
+        String lastName = "Shields";
+        ArrayList<Double> examScores = new ArrayList<Double>(Arrays.asList(80.0, 87.0, 100.0, 90.0));
+        Student student = new Student(firstName, lastName, examScores);
+        String expected ="Student: Kai Shields" +
+                ", Average Scores: 89.25" +
+                "Exam Scores:\n" +
+                " \tExam 1 -> 80.0\n" +
+                " \tExam 2 -> 87.0\n" +
+                " \tExam 3 -> 100.0\n" +
+                " \tExam 4 -> 90.0\n";
+        String actual = student.toString();
+        Assert.assertEquals(expected, actual);
+    }
 
 }
\ No newline at end of file
diff --git a/target/classes/io/zipcoder/Classroom.class b/target/classes/io/zipcoder/Classroom.class
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index 0000000..aa25d2f
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diff --git a/target/classes/io/zipcoder/Student.class b/target/classes/io/zipcoder/Student.class
new file mode 100644
index 0000000..62c3a9f
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diff --git a/target/test-classes/io/zipcoder/ClassroomTest.class b/target/test-classes/io/zipcoder/ClassroomTest.class
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index 0000000..be0649d
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diff --git a/target/test-classes/io/zipcoder/StudentTest.class b/target/test-classes/io/zipcoder/StudentTest.class
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