Practice tests are very necessary. When i was young, my father used to design mock question sets to practice for the exams. Now, he advised me to sign up for mock tests online. He was very impressed with the site and it helped me earn my EC-Council NDE certification.
EC-Council 112-51 Books
Use this quick start guide to collect all the information about EC-Council NDE (112-51) Certification exam. This study guide provides a list of objectives and resources that will help you prepare for items on the 112-51 EC-Council Network Defense Essentials exam. The Sample Questions will help you identify the type and difficulty level of the questions and the Practice Exams will make you familiar with the format and environment of an exam. You should refer this guide carefully before attempting your actual EC-Council NDE certification exam.