Imagine if you could have all of the practice you need from one study guide and score very high on the CDL Exam. This CDL study guide combines theory and practice questions so that students are fully prepared before writing the exam. While other guides only provide around 100 questions, this guide has 425 questions along with answer explanations. About Newstone Test Prep Newstone Test Prep provides students with up-to-date test questions so that they are well prepared before taking the exam. We take pride in our guides because they combine both theory and test questions. At Newstone Test Prep, we do not just compile test questions; we compile the same number of questions as the real exams, in the same format. This has been a great help for past students because they were able to simulate the real exam while studying. Thousands of students have scored higher on their exams after using our study guides. You will too.