I tried to prepare for my certification exam with a book study guide. This turned out to be information overload for me! I tried some practice tests but only scored in the 50s and 60s. I came across some manuals from 240 Tutoring and found that they were very easy to read and understand. I decided to purchase their online material. It was the best decision ever. Their material gave me guidance and helped me to focus on areas of study. Once I took the actual test, I realized that the questions were worded similar or asked about similar concepts. I completed the test with ease and passed! I will definitely recommend this to others and will be buying more study material from them.