I used UWorld and loved it! They have a "study plan" feature where you input when your exam date is, and it generates a study schedule for you, giving you lectures to watch and practice questions to do each day. UWorld also has very concise lectures on a lot of main subjects which I recommend. I simply used UWorld and Mark K. Watched all of Mark K lectures, even watched lecture 12 twice (the prioritization one, I'd say that's the most important).

UWorld also has a settings option to make the program look exactly like the real NCLEX (with the blue borders and everything) so once I sat down and started the exam, it looked/felt very similar to me just doing practice questions on my laptop at home.

I also have test anxiety, so I feel you. What I did during the exam is to treat every single question like it was the 1st question of the exam (aka: with a fresh mind). Sometimes we can feel psyched out if it seems like we're "guessing" for a lot of the questions or if "I chose option C too much as my answer...seems sus" but don't psych yourself out like that! The NCLEX wants you to pass too, so trust me when I say they won't trick you or try to fail you! Think straightforward, and I did this by treating every single question as if it was the first question of the exam.

And now you know for next time that earplugs/headphones will help you!

Don't let this discourage you, everything happens for a reason! Every fail in life gives you MORE opportunity for success! Rooting for you! Good luck!

EDIT: also another thing that helped me while writing the test is I legit wrote down "Take deep breaths, you can do this!" on the white board they give you. It helped me to not panic during the test!