public function month_wise_due($grade_due, $new_due, $id, $remaining) {

        $now1 = time();
        $now = date('F, Y', $now1);

        $store = array(
            'mwf_month' => $now,
            'mwf_previous' => $remaining,
            'mwf_due' => $grade_due,
            'total_due' => $new_due,
            'mwf_student_id' => $id,
            'mwf_pay_day' => 'Not Yet Paid',
            'mwf_payment' => 0,
            'mwf_diff' => $new_due
        );

        $this->db->trans_start();
        $this->db->insert('mwf', $store);
        $this->db->trans_complete();
    }