Most, if not all people have trouble with AP. Honestly, if you are having that much trouble, and by no means am I telling you to quit, maybe you should finish that class and other difficult prereqs before continuing. I didn't do it that way at all and it was a constant struggle. All of your grades suffer because of it. AP just takes T-I-M-E. Our teacher told us that you MUST devote 3 hours/day, every day to studying AP if you wanted to pass.
But talk to the people who are doing well in the class. Do the flash cards. Do the online study things. Get the analogy study manuals. Worksheets. Find out what works best for you as a student. I had a hard time in nursing classes because I have never been a reader. I have always been an auditory learner. Tell me, teach me, show me..... I will remember. Make me read it and give me a test over it..... huge F.
Balance out your time if you can. If you are doing great in other classes, spend less time on them. You may end up with a bunch of C's, and you may not want that at all, but hey thats how it is sometimes if you want to pass all your classes. I know it sounds insane, but if thats the only way to get thru it and graduate for you... more power to you. You will still end up a great nurse eventually.