Well, it only depends on you. Tableau Desktop Specialist Certification practice test is usually the most feasible way to evaluate yourself and find out whether or not you are ready to take the actual exam. And if you feel confident enough and don’t feel the need to take the practice exam then it is totally fine. But generally speaking, taking the practice exam test would give you a good idea about how to solve the actual exam and would increase your speed. So to be on the safe side, it is best to take the practice exam.