If the registered user of a certification guide fails the corresponding exam ONCE within 90 days of purchase , contact us -- we will refund your order, or you will can got free updated version! For member, we DON'T do any refunded, because they can download all exams, we cannot guarantee each product always can pass at the customer first try test. Not all products can help u pass the exam at first 100%, about 2% exams maybe faild. But don't worry, we always provide new updated in our website. thanks!