diff --git a/src/CourseRegistrationStarter/Main.java b/src/CourseRegistrationStarter/Main.java
index 8f06373..838b280 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 course1 = new Course( "Advanced Programming" , "AP1404" ,  2);
+        Course course2 = new Course( "Data Structures" , "DS2201" ,  1);
+        Course course3 = new Course( "Database Systems" , "DB3301" ,  3);
+
+        Student A = new Student( "Ali" , "402222001");
+
+        RegistrationSystem system = new RegistrationSystem();
+
+        system.addCourseToSystem(course1);
+        system.addCourseToSystem(course2);
+        system.addCourseToSystem(course3);
+
+        A.addCourse(course2);
+        A.addCourse(course3);
+
+        A.dropCourse(course2);
+
+        A.showRegisteredCourses();
+        system.showAllCourses();
     }
 }
diff --git a/src/CourseRegistrationStarter/RegistrationSystem.java b/src/CourseRegistrationStarter/RegistrationSystem.java
index 934f222..c8beeeb 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.getCourseName() + " (" + c.getCourseCode() + ")" + " Remaining Capacity: " + c.getCapacity());
+        }
     }
 }
diff --git a/src/CourseRegistrationStarter/Student.java b/src/CourseRegistrationStarter/Student.java
index 02c11d8..b7a1090 100644
--- a/src/CourseRegistrationStarter/Student.java
+++ b/src/CourseRegistrationStarter/Student.java
@@ -21,19 +21,28 @@ 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
+        if ( c.getCapacity() > 0)
+        {
+            registeredCourses.add(c);
+
+            c.reduceCapacity();
+
+            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
+        if (registeredCourses.remove(c)) {
+            c.increaseCapacity();
+            return true;
+        }
         return false;
     }
 
     public void showRegisteredCourses() {
-        // TODO: Print all registered courses
+        for (Course c : registeredCourses) {
+            System.out.println(c.getCourseName() + " (" + c.getCourseCode() + ")");
+        }
     }
 }
\ No newline at end of file