You reserve the right to return any un-used books within 14 days of receiving them. You must email us at website@totuseducation.com to inform us that you wish to return them where we will provide the return address. A full refund will be processed once we have received the books and verified that they are unused. When returned, should they show signs of use they will be returned to you and no refund shall be issued. Postage costs of returning books is payable by the customer.