global $wpdb;
    $table_name = $wpdb->prefix . 'sodae_enrolled';
    $wpdb->insert($table_name, array(
         "student_name" => $_POST['student_name'],
         "student_id" => $_POST['student_id'],
         "class_of" => $class,
         "assignment_name" => $assign,
         "grade" => $_POST['grade']
    ), array(
        "%s",
        "%s",
        "%s",
        "%s",
        "%s"
    ));