As i first-timer, I decided to prepare for the certificate using erpprep due to following reasons:
Get to know the question-types
Use the test simulation in order to familiarize with the duration of the exam (3h) in relation to the number of questions (80), with this know-how you approach the real certification more comfortable and can focus more on content
Questions are identical almost to the point
History of sessions is recorded (to track your improvement), each test session is logged and can be accessed
I really do can reccommend to use erpprep, for all types of exam-taking strategies:
As a first timer to get familiar with the procedure
As a experienced certificate "taker" to focus straight-forward on the questions only
KR