diff --git a/src/CourseRegistrationStarter/Main.java b/src/CourseRegistrationStarter/Main.java
index 8f06373..263bba5 100644
--- a/src/CourseRegistrationStarter/Main.java
+++ b/src/CourseRegistrationStarter/Main.java
@@ -2,13 +2,24 @@ package CourseRegistrationStarter;
 
 public class Main {
     public static void main(String[] args) {
-        // TODO:
-        // 1. Create at least 3 courses
-        // 2. Create 1 student
-        // 3. Create a registration system
-        // 4. Add courses to the system
-        // 5. Register the student in some courses
-        // 6. Drop one course
-        // 7. Print the final registered course list
+        Course c1 = new Course("Introduction to Programming", "CS101", 30);
+        Course c2 = new Course("Data Structures", "CS201", 25);
+        Course c3 = new Course("Algorithms", "CS301", 20);
+
+        Student student = new Student("Alice", "S1001");
+
+        RegistrationSystem system = new RegistrationSystem();
+        system.addCourseToSystem(c1);
+        system.addCourseToSystem(c2);
+        system.addCourseToSystem(c3);
+
+        student.addCourse(c1);
+        student.addCourse(c2);
+        student.addCourse(c3);
+
+        student.dropCourse(c2);
+
+        System.out.println("Registered courses for " + student.getName() + ":");
+        student.showRegisteredCourses();
     }
 }
diff --git a/src/CourseRegistrationStarter/RegistrationSystem.java b/src/CourseRegistrationStarter/RegistrationSystem.java
index 934f222..f7af0cd 100644
--- a/src/CourseRegistrationStarter/RegistrationSystem.java
+++ b/src/CourseRegistrationStarter/RegistrationSystem.java
@@ -9,16 +9,21 @@ public class RegistrationSystem {
     }
 
     public void addCourseToSystem(Course c) {
-        // TODO: Add the course to the system
+        courses.add(c);
     }
 
     public Course findCourseByCode(String code) {
-        // TODO: Search for a course by course code
-        // Return the matching course if found, otherwise return null
+        for (Course c : courses) {
+            if (c.getCourseCode().equals(code)) {
+                return c;
+            }
+        }
         return null;
     }
 
     public void showAllCourses() {
-        // TODO: Print all courses in the system
+        for (Course c : courses) {
+            System.out.println(c.getCourseCode() + " - " + c.getCourseName() + " (Capacity: " + c.getCapacity() + ")");
+        }
     }
 }
diff --git a/src/CourseRegistrationStarter/Student.java b/src/CourseRegistrationStarter/Student.java
index 02c11d8..89907f9 100644
--- a/src/CourseRegistrationStarter/Student.java
+++ b/src/CourseRegistrationStarter/Student.java
@@ -21,19 +21,26 @@ public class Student {
     }
 
     public boolean addCourse(Course c) {
-        // TODO: Register the student in the course if capacity allows
-        // Return true if registration was successful, otherwise false
+        boolean success = c.reduceCapacity();
+        if (success) {
+            registeredCourses.add(c);
+            return true;
+        }
         return false;
     }
 
     public boolean dropCourse(Course c) {
-        // TODO: Remove the course from the student's list
-        // Restore the course capacity if removal was successful
-        // Return true if the course was dropped, otherwise false
+        boolean removed = registeredCourses.remove(c);
+        if (removed) {
+            c.increaseCapacity();
+            return true;
+        }
         return false;
     }
 
     public void showRegisteredCourses() {
-        // TODO: Print all registered courses
+        for (Course c : registeredCourses) {
+            System.out.println(c.getCourseCode() + " - " + c.getCourseName());
+        }
     }
 }
\ No newline at end of file