Let's start with the basics: traffic laws and road signs. You'll need to know the rules of the road, like what a yield sign means and when to come to a complete stop. It's not rocket science, but it's still important to study up and make sure you understand the fundamentals.
Practice makes perfect, and that's especially true when it comes to taking practice tests. The more you practice, the more comfortable you'll become with the material, and the more confident you'll feel on test day. Plus, it's a great way to identify areas where you need to focus your studying.