diff --git a/Admin.cpp b/Admin.cpp
new file mode 100644
index 0000000..386cba3
--- /dev/null
+++ b/Admin.cpp
@@ -0,0 +1,6 @@
+#include "Admin.h"
+
+Admin::Admin(int id, const std::string& username, const std::string& password)
+    : User(id, username, password) {
+    role = Role::ADMIN;
+}
\ No newline at end of file
diff --git a/Admin.h b/Admin.h
new file mode 100644
index 0000000..fc4f936
--- /dev/null
+++ b/Admin.h
@@ -0,0 +1,14 @@
+#ifndef ADMIN_H
+#define ADMIN_H
+
+#include "User.h"
+#include <iostream>
+
+class Admin : public User {
+public:
+    Admin(int id, const std::string& username, const std::string& passwordHash);
+
+    void displayMenu() const override;
+};
+
+#endif
\ No newline at end of file
diff --git a/Course.cpp b/Course.cpp
new file mode 100644
index 0000000..5309de4
--- /dev/null
+++ b/Course.cpp
@@ -0,0 +1,10 @@
+#include "Course.h"
+
+Course::Course(int id, const std::string& name)
+    : id(id), name(name) {}
+
+int Course::getId() const { return id; }
+
+std::string Course::getName() const { return name; }
+
+void Course::setName(const std::string& name) { this->name = name; }
\ No newline at end of file
diff --git a/Course.h b/Course.h
new file mode 100644
index 0000000..f0f19ed
--- /dev/null
+++ b/Course.h
@@ -0,0 +1,20 @@
+#ifndef COURSE_H
+#define COURSE_H
+
+#include <string>
+
+class Course {
+private:
+    int id;
+    std::string name;
+
+public:
+    Course(int id, const std::string& name);
+
+    int getId() const;
+    std::string getName() const;
+
+    void setName(const std::string& name);
+};
+
+#endif
\ No newline at end of file
diff --git a/Grade.cpp b/Grade.cpp
new file mode 100644
index 0000000..5412001
--- /dev/null
+++ b/Grade.cpp
@@ -0,0 +1,12 @@
+#include "Grade.h"
+
+Grade::Grade(int studentId, int courseId, float value)
+    : studentId(studentId), courseId(courseId), value(value) {}
+
+int Grade::getStudentId() const { return studentId; }
+
+int Grade::getCourseId() const { return courseId; }
+
+float Grade::getValue() const { return value; }
+
+void Grade::setValue(float value) { this->value = value; }
\ No newline at end of file