What exactly is a permit practice test?

ive done a few different tests over the past few days and most of the questions are relatively similar so MY question is do they take some if not all of the questions from the real test and put them into a practice test or are they completely different so people have no idea what they need to know?|||They are usually the same questions, sometimes rephrased. Pay attention to the questions that have signs, where you have to identify the signs. It is pretty basic stuff, so try not to stress. If you are studying then that is great, and you will remember all of it.