That depends on whether you want a baseline evaluation now, or whether you want to see how well you’ve learned the material later.
We designed our simulation tests to be created with “unused” questions that you’ve never seen before. To get the most out of this feature, create your simulations while you have a minimum of 1000 unused questions in your test bank. You can suspend the simulated tests and take them later, after you’ve used the remaining questions to prepare.