diff --git a/src/main/java/io/zipcoder/Classroom.java b/src/main/java/io/zipcoder/Classroom.java
index 64566f0..520f73a 100644
--- a/src/main/java/io/zipcoder/Classroom.java
+++ b/src/main/java/io/zipcoder/Classroom.java
@@ -1,4 +1,107 @@
 package io.zipcoder;
 
-public class Classroom {
+import java.util.*;
+import java.util.function.ToLongFunction;
+
+public class Classroom implements Comparator<Student> {
+    private Student[] students;
+    private Integer maxNumberOfStudents;
+
+    //constructor 1: int representative of the maxNumberOfStudents that this Classroom can hold.
+    public Classroom(Integer maxNumberOfStudents) {
+        this.students = new Student[maxNumberOfStudents];
+    }
+    //constructor 2 Student[] representative of the collection of Student objects this Classroom will store.
+    public Classroom(Student[] students) {
+        this.students = students;
+    }
+    //constructor 3: nullary. initializes the composite students object o
+    //be an empty array of 30 Student objects
+    public Classroom() {
+        this.students = new Student[30];
+    }
+    //getter return the composit students object
+
+    public String getStudents() {
+        StringBuilder builder = new StringBuilder();
+        for (Student s : students) {
+            builder.append("===================\n");
+            try {
+                builder.append(s.toString());
+            } catch (Exception e) {
+                builder.append("No Students Currently Enrolled\n");
+            }
+            builder.append("===================\n\n");
+        }
+            return builder.toString();
+        }
+    //getter: returns sum of all exams divided by the number of students
+    public Double getAverageExamScore() {
+        double sum = 0.0;
+        for (Student s : students) {
+            if (s != null) {
+                sum += s.getAverageExamScore();
+            }
+        }
+        return sum / students.length;
+    }
+    //addStudent student uses Student parameter to add a Student object to students list
+    public void addStudent(Student student) {
+        List<Student> studentsList = new ArrayList<>(Arrays.asList(students));
+        studentsList.add(student);
+        studentsList.remove(null);
+        students = studentsList.toArray(new Student[0]);
+    }
+
+    //removes student from students object. array is re-ordered after removed. null at end
+    public void removeStudent(String firstName, String lastName) {
+        List<Student> studentList = new ArrayList<>(Arrays.asList(students));
+        for (Student s : studentList) {
+            if (s.getFirstName().equals(firstName) && s.getLastName().equals(lastName)) {
+                studentList.remove(s);
+                break;
+            }
+        }
+        studentList.sort(this);
+        students = studentList.toArray(new Student[0]);
+    }
+
+    //can't mdify arrays.asList so wrapper ArrayList
+    public ArrayList<Student> getStudentByScore() {
+        ArrayList<Student> studentList = new ArrayList<>(Arrays.asList(students));
+        studentList.sort(this);
+        return studentList;
+    }
+
+    //getStudentByScore returns and array representation of Student object sorted in descending score order.
+    //if two students same score, order them lexigraphically
+    public String getGradeBook() {
+        Map<String, ArrayList<Student>> gradeBook = new TreeMap<>();
+        ArrayList<Student> sortedStudentList = getStudentByScore();
+        Integer binSize = sortedStudentList.size() / 5;
+        gradeBook.put("A", new ArrayList<>(sortedStudentList.subList(0, binSize)));
+        gradeBook.put("B", new ArrayList<>(sortedStudentList.subList(binSize, binSize * 2)));
+        gradeBook.put("C", new ArrayList<>(sortedStudentList.subList(binSize * 2, binSize * 3)));
+        gradeBook.put("D", new ArrayList<>(sortedStudentList.subList(binSize * 3, binSize * 4)));
+        gradeBook.put("F", new ArrayList<>(sortedStudentList.subList(binSize * 4, binSize * 5)));
+
+        StringBuilder builder = new StringBuilder();
+        for (Map.Entry entry : gradeBook.entrySet()) {
+            builder.append("" + entry.getKey() + " Students: \n\n\n" + entry.getValue().toString() + "\n");
+        }
+        return builder.toString();
+    }
+
+    @Override
+    public int compare(Student o1, Student o2) {
+        return 0;
+    }
+
+    @Override
+    public Comparator<Student> thenComparingLong(ToLongFunction<? super Student> keyExtractor) {
+        return null;
+    }
 }
+
+
+
diff --git a/src/main/java/io/zipcoder/Student.java b/src/main/java/io/zipcoder/Student.java
index b543e36..07b86e5 100644
--- a/src/main/java/io/zipcoder/Student.java
+++ b/src/main/java/io/zipcoder/Student.java
@@ -1,4 +1,85 @@
 package io.zipcoder;
+import java.util.Arrays;
+import java.util.ArrayList;
 
-public class Student {
+public  class Student {
+    private String firstName;
+    private String lastName;
+    private ArrayList<Double> examScores;
+
+    public Student(String firstName, String lastName, Double[] examScores) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+        this.examScores = new ArrayList<>(Arrays.asList(examScores));
+    }
+
+    public Student() {
+        this.firstName = "First";
+        this.lastName = "Last";
+        this.examScores = null;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public ArrayList<Double> getExamScores() {
+        return examScores;
+    }
+
+    //public Double getExamScoresAsString() {
+    //    Student student = new Student();;
+    //    return getScoresAsString(input);
+   // }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public Integer getNumberOfExamsTaken() {
+        return this.getExamScores().size();
+    }
+
+    public void addExamScore(double examScore) {
+        this.examScores.add(examScore);
+    }
+
+    public void setExamScores(int examNumber, double newScore) {
+        examScores.remove(examNumber - 1);
+        examScores.add(examNumber - 1, newScore);
+    }
+
+    public double getAverageExamScore() {
+        Double sum = 0.0;
+        for (int i = 0; i < examScores.size(); i++) {
+            sum += examScores.get(i);
+        }
+        return sum / getNumberOfExamsTaken();
+
+    }
+
+    public String toString() {
+        String output = "Student Name: " + firstName + " " + lastName + "\n> Average Score: " + getAverageExamScore() + "\n> Exam Scores:\n";
+        return getScoresAsString(output);
+    }
+
+    private String getScoresAsString(String output) {
+        for (int i = 0; i < examScores.size(); i++) {
+            output += "\tExam " + (i + 1) + " -> " + Math.round(examScores.get(i)) + "\n";
+        }
+
+        return output;
+    }
 }
+
+
+
+
diff --git a/src/test/java/io/zipcoder/ClassroomTest.java b/src/test/java/io/zipcoder/ClassroomTest.java
index 7bac1ff..3f338ad 100644
--- a/src/test/java/io/zipcoder/ClassroomTest.java
+++ b/src/test/java/io/zipcoder/ClassroomTest.java
@@ -1,4 +1,20 @@
 package io.zipcoder;
 
+import org.junit.Test;
+
 public class ClassroomTest {
+
+    @Test
+    public void gtStudentsTest() {
+        //given
+        Double[] examScores = {};
+        Student student1 = new Student("Cameron", "Howard", examScores);
+        Student student2 = new Student("April", "Howard", examScores);
+        Student[] students = {student1, student2};
+Classroom classroom = new Classroom(students);
+        //when
+        String output = classroom.getStudents();
+        //then
+        System.out.println(output);
+    }
 }
diff --git a/src/test/java/io/zipcoder/StudentTest.java b/src/test/java/io/zipcoder/StudentTest.java
index a9fedec..8c8f69a 100644
--- a/src/test/java/io/zipcoder/StudentTest.java
+++ b/src/test/java/io/zipcoder/StudentTest.java
@@ -1,5 +1,136 @@
 package io.zipcoder;
 
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.ArrayList;
+
+import static org.junit.Assert.assertEquals;
+
 public class StudentTest {
+    String expectedFirstName = "";
+    String expectedLastName = "";
+    Double[] examScores = {};
+    Student student = new Student();
+
+
+    @Before
+    public void setUp() throws Exception {
+        String expectedFirstName = "";
+        String expectedLastName = "";
+        Double[] examScores = {};
+        Student student = new Student();
+    }
+
+    // @After
+    //public void tearDown() throws Exception {
+    //   return null;
+    // }
+
+    @Test
+    public void setFirstNameTest() {
+        //Given
+        Student student = new Student();
+        String expected = "April";
+        //When
+        student.setFirstName(expected);
+        String actual = student.getFirstName();
+        //Then
+        Assert.assertEquals(expected, actual);
+        System.out.println(expected);
+        System.out.println(actual);
+    }
+
+    @Test
+    public void getFirstName() {
+        //Given
+        String expected = "Jill";
+        //When
+        student.getFirstName();
+        String actual = student.getFirstName();
+        //Then
+        Assert.assertEquals(expected, actual);
+        System.out.println(expected);
+        System.out.println(actual);
+    }
+
+
+    @Test
+    public void getLastName() {
+        Student student = new Student();
+        String expected = "Jordan";
+
+        // When
+        student.getLastName();
+        String actual = student.getLastName();
+
+        // Then
+        assertEquals(expected, actual);
+    }
+
+
+    @Test
+    public void setLastName() {
+        //Given
+        Student student = new Student();
+        String expected = "April";
+        //When
+        student.setLastName(expected);
+        String actual = student.getLastName();
+        //Then
+        Assert.assertEquals(expected, actual);
+        System.out.println(expected);
+        System.out.println(actual);
+    }
+
+    @Test
+    public void getExamScores() {
+        //Given
+        Student student = new Student();
+        Double expected = 55.00;
+        //When
+        student.getExamScores();
+        ArrayList<Double> actual = student.getExamScores();
+        //Then
+        Assert.assertEquals(expected, actual);
+        System.out.println(expected);
+        System.out.println(actual);
+    }
+
+    @Test
+    public void addExamScore() {
+        //Give
+       String firstName = "Geg";
+       String lastName = "Geggy";
+       Double[] examScores = {100.};
+       Student student = new Student();
+
+       addExamScore();
+
+       ArrayList<Double> actual = student.getExamScores();
+       Assert.assertEquals("Exam: ", actual);
+    }
+
+    @Test
+    public void setExamScores() {
+        Student student = new Student();
+        student.setExamScores(1, 100.);
+        ArrayList<Double> actual = student.getExamScores();
+        Assert.assertEquals("Exam 1: 100.00", actual);
+    }
+
+    @Test
+    public void getAverageExamScore() {
+        Student student = new Student();
+        Double[] actual = {100., 75., 95., 100.};
+        double expected = 92.5;
+        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..e3204d5
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diff --git a/target/classes/io/zipcoder/Student.class b/target/classes/io/zipcoder/Student.class
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index 0000000..f9f9515
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diff --git a/target/test-classes/io/zipcoder/ClassroomTest.class b/target/test-classes/io/zipcoder/ClassroomTest.class
new file mode 100644
index 0000000..c19cae1
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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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index 0000000..c7adbd6
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