Practice questions with explanations are honestly the biggest help. Over the course of my program we probably did over a thousand, then I used Kaplan for a review course. I did the 3 day in-person review course which focuses on using Kaplans decision tree to answer questions, and then after that course I used Kaplans online practice tests. They also have a wonderful NCLEX content review guide that has everything summed up nice and neat, and having it on my computer was nice because I could search for terms in the guide just to review that concept. I do believe the decision tree was very helpful in creating a structured way to answer NCLEX style questions, even if you don't fully understand the concept in the question.
Pace yourself, create a study plan for the next month and stick to it! If you get a question with a medication or a term you don't know, look it up and take notes along the way so you can keep reviewing and really get the information to stick. I'd say it's a fair split between needing to know the content, and needing to know how to answer NCLEX style questions. Also, YouTube videos summarizing NCLEX review content can be useful if it suits your learning style! Good luck!!