No other practice exams come close to Transcender in regards to accuracy. I found that at least 3-4 of the practice questions are exact, word for word, as they are in the actual tests. Definately worth every penny. From what I've heard, the Exam Cram books are good as well. If you can't afford the Transcenders, this may be your best shot.
Nothing beats practical experience.
Unlike the Novell tests where all the information you need is contained in the course materials, Microsoft exams will throw questions at you that can't be answered by looking in the course materials alone. If you're working with NT at your job, use it - as much as possible. If possible, build a machine at home for your own personal use and put NT on it. Install it a few times, break it and then troubleshoot. Keep in mind however, that there's a practical way, and then there's the Microsoft way.