You get to see what types of questions are asked, how they're asked, and what the correct answer is. You'll be able to predict what's going to be on the exam, which will make it easier to study.
The more you practice, the better you'll get. It's like learning to play the piano or ride a bike. The more you do it, the more natural it becomes.
When you practice with PYQs, you're not just memorizing facts and figures. You're learning how to think critically, solve problems, and apply what you've learned in real-life situations.