Sorry you are having a hard time but DO NOT give up!
Here's what worked for me and it's what I always tell new grads:
1. Study to learn it, not memorize. Be able to explain it to someone else in your own words. That's how you know you've mastered the content.
2. Take the NCLEX as though you're in the perfect hospital setting. Meaning, you have all the necessary supplies, you have all the necessary staff, etc
3. When you read the question picture yourself in the hospital setting as though it's reality, what would you do first or what is the best action for that patient at that time?
4. Only do 75 questions at a time, only answer them. Do not read into them, do not study answers to them, just do the questions. Once finished, go back and grade them. If you have it correct, great. If you have it wrong, do you understand why it's wrong? If yes, move on. If no, review that subject and that subject only! Do not overstudy or re-study and confuse yourself more. Do focused study only.
5. In accordance with #4, use only NCLEX review books and answer their test questions only. Try to use books within the past 5 years. Check them out at your local library if necessary because purchasing them can get expensive.
6. Do not study the day before the test, relax your mind and calm yourself down. Example, if your test is Friday, stop studying no later than 8pm Wednesday evening. Don't study at all Thursday cause it'll undermine all of the information you already know and make you anxious all over again. And do not ever review anything the day of the test, it'll only further increase your anxiety.
I have more but those are the main points.
I wish you luck, but please don't give up!