I really struggled with this, too! There are two things that have really helped me:

1. I've removed my access to instagram, twitter, facebook, and pretty much any social media with reels. I was having so much trouble sitting through a practice test (or even just a 35 minute section) and my scores were SO horrible when I would make it through. Eventually, I just had to do a total detox from scrolling. Obviously, taking a mind-break every few days is ok, so I'm not saying go completely off the grid, but the further from the endless scrolling you can get, the better.

2. Don't study in your house. It's too easy to get distracted by a snack in the fridge, a noisy housemate (or in my case, upstairs neighbor), or the desire to log out and start watching TV. Be intentional with your study time - go to a coffee shop, library, or a million other places, treat it like that's your test environment. After I fixed the social media stuff, I was still having some trouble with increasing my score on practice tests. Eventually, I tried to study at the business center for my property, and it made a huge difference. My score literally shot up 14 points (153 -> 167) in one practice test because I was able to actually focus and apply the skills that I had spent weeks developing.

The nerves will still probably be there, but take a deep breath, trust the work you've been putting in, and go crush it! You can do this!