We all use textbooks and training videos when prepping for vendor certification exams, but practice exams are an often forgotten study tool.
Practice exams allow you to apply your knowledge to questions no only reinforcing your learning but also helping you to apply what you have learned from your study guides or training videos.
You can take each exam as many times as you wish. Each time round you learn more and remember more. These practice exams are an essential part of your study program and can save you hundreds of dollars in wasted fees come exam day.