While the test questions themselves are very valuable, the program has a NUMBER of bugs in it which cause the questions and answers to be mismatched. For example, when you ask it to show you the answer to question 10 it may show you the answer to question 11 instead. Other bugs include showing you the answers as part of the question. EX: What is the right answer? A) yada yada B) yada yada C) this is the answer and why it's right. Very odd results occur while you are taking the practice tests. Some of the answers they provide are incorrect, a problem with their study guides as well. For example, several times they give you the START parameters incorrectly, and they can't seem to keep the default priority of applications straight. Once chapter references in correctly as 7, another will reference it as 8. It's clear that they have multiple people each write a chapter and throw it together with less than adequate technical editing. Someone wrote a review of their TCP/IP study guide and it was less than glamorous. If you're looking for a series of test questions, their paper version is much better (MCSE Certification Test Yourself Practice Exams ISBN 0-07-211854-7). You still have to deal with a few incorrect answers but at least you don't have to struggle with an application interface as well. It's always good to take as many test questions as possible, but the number of mistakes in this product make it very difficult to find it valuable.