CREATE TABLE exams ( id INT PRIMARY KEY, name VARCHAR(255), date DATE, class_id INT, subject_id INT );

public function close() { $this->mysqli->close(); } }

CREATE TABLE grades ( id INT PRIMARY KEY, student_id INT, subject_id INT, grade VARCHAR(255) ); And here's a sample PHP code snippet using MySQLi to interact with the database:

CREATE TABLE classes ( id INT PRIMARY KEY, name VARCHAR(255), section VARCHAR(255) );

CREATE TABLE students ( id INT PRIMARY KEY, name VARCHAR(255), email VARCHAR(255), phone VARCHAR(255), address VARCHAR(255) );

<?php class Database { private $mysqli;

$db->close(); Note that this is just a basic example to get you started. You'll need to expand on this to create a fully functional School Management System.