I'm an instructor at a Microsoft® Technical Education Center. I have helped dozens of students through hundreds of tests, and I've compiled a list of the advice that has really helped many people through their tests. 

1. You only have one question to worry about: The one you're on. If you're thinking about whether or not you missed the last question, then you'll probably miss this one. If you loose focus, take a break, yawn, stretch, do jumping jacks, whatever you need to do to clear your head till you can focus on the question in front of you.

2. Look for the concept. Every test question has a main concept. Even the most lengthy question can be boiled down to one or two key concepts. Once you identify the concept, then you know what Microsoft® is really asking you. The answer often becomes obvious.

3. Write down everything. The testing center gives you paper or a sheet to write on, so use it. Write down diagrams, IP addresses, key points, whatever seems relevant to the question. This will help you focus on the question concept.

4. Never go back. Microsoft® lets you mark questions for review. Don't do it. From a psychological standpoint, you're setting yourself up for failure. When you aren't sure about an answer, your first guess is statistically the most accurate. When you go back to review, you will tend to doubt your first guess, and second guess yourself. Trust me. Don't mark for review.

5. There's nothing new on the test. If you have studied for the tests, then you have probably seen all the material. If there is a term in the answers that you've never seen before, then that is probably the wrong answer. You may have the tendency to think "Maybe a Plutonium Nyborg Generator DOES dynamically assign IP addresses." It doesn't. Go with what you know: Even when you have to guess.

6. If you guess, guess right. Not everyone knows all the answers. If you have four to choose from, you've got a 25% chance of being right. If you don't know the right answer, try to spot the wrong answers. If you know that two of the answers are wrong, then you've narrowed your odds to 50%

7. You don't know the score till the end. Sometimes when you get a few hard questions in the beginning of an exam, you think you've failed the test. You haven't. Put those questions out of your mind and move on. If you think you'll fail, then you probably will. On some tests, you can miss as many as twenty questions! Your passing this test!

8. Buy practice test software. There is nothing that helps taking a test like having seen all the questions and methods.

9. If you fail a test, don't wait. Cram your brains out, and go back to take it again. You may have just had a hard test. Your questions are assigned at random, and it is possible to get a super hard, or a super easy test. Get up, Dust yourself off, and get back on that pony.

10. Study Study Study. There is no substitute for knowing the material. Study the book, do the hands-on exercises (even if they seem dumb), Take your test prep exams till you sweat Microsoft®, and then when you can't fit another scrap of information into your head, immediately go test. Don't wait, when you know it, test it!