The Data Modeling Pre-Certification Assessment is free to take and the Data Modeling Certification Exam is $199. You can take the free Data Modeling Pre-Certification Assessment to determine your readiness for the Exam. This 20-question Assessment contains similar (but not identical) questions to what will be faced in the 100-question Exam. You do not receive a certification for passing the Assessment, and you can take the Assessment as many times as you like. Register here.
If you do not pass the Exam, you have a second chance to take the Exam at no charge.