I'm another who will say that you should try the OPPOSITE of what you were doing to study -- it obviously isn't working for you the way you have been doing it.
I would also recommend that you get some academic counseling from someone in the nursing department. You need to figure out WHAT you're having problems with and what you can do to work around that problem. Because if you don't fix what's wrong, you're going to struggle with every subsequent class the same way you're struggling with these -- nursing classes are all pretty similar in the way they are set up and the types of questions that are on the exams.
For example, do you have trouble learning the diseases? Maybe try reading the same chapter from a different textbook to see if it makes more sense (one semester our book was a real snooze-fest... all the information was factual, but it would put you to sleep if you tried to read it!). Different authors have a different approach to things, so reading the same info in a different book might be enough for you.
Or do you have trouble remembering the nursing interventions that go along with a disease? Maybe write them out longhand, then type them up, then write them out on a whiteboard in the room where you study. Make flashcards to carry with you (or to download onto your phone). Come up with mnemonics to help you remember them. Put them in a rhyme. Sing them in a song.
Or do you have trouble "reading" the questions on the tests? This inability to read the critical-thinking format is the biggest problem that I see with my classmates, to tell you the truth. You need to be able to find the stem of the question and work from there. There are several books that help with this. This one
is just an example, there are several others out there as well. Another thing that can help with this problem is to read NCLEX review books that have both questions and rationales
in them. It's not enough to just know that "C was the correct answer" -- you need something that says, "A is incorrect because _________ and B is incorrect because _______ and C is correct because ___________ and D is incorrect because _________". This helps you to look back at the question again to analyze what exactly they were asking for.
I've found that nursing exam questions typically offer up four items from which to choose, and two are easy to throw out as being totally wrong, then there are two others that both seem correct. Reading the rationales in a book of NCLEX questions can help you to discern which of the two correct answers is "most correct".
But first, you NEED to figure out what exactly it is that you're not getting and figure out a way to get beyond that issue. Use the resources that are available at your school -- I guarantee you that the nursing instructors have helped hundreds before you and have a lot of valuable information to share with you.