I teach BSN students and tutor NCLEX students. There are two parts to this process and if you have spent all of this time on content - you may need to take a break and spend some time on the process. There is a formula for construction of NCLEX questions. I'm sure UWorld and Kaplan etc. all spent time and space looking at these rules. It is possible to increase your chances of choosing the correct answer even when you're not positive about the content. The exam report from NCLEX doesn't provide a detailed assessment of your content score - neuro, pedie, OB etc, so that means that you need to make that assessment yourself with study questions. Identify and reinforce your weaknesses and keep working on the mechanics of the questions and develop strategies to make the best choice. I wish you well!