Random thoughts -
Maybe I haven't found the right group to study with, but so far I have been much more productive studying on my own. Some of us neurotic folk type up all of our notes and post them before a test, which allows others in our class to see if we've missed something (or most use it to study without worrying about it).
Nursing texts are hit or miss. Depending on your reading style, some might be a complete waste of time. I use Griffith's 5-minute Clinical Consult, which is a medical text, whenever I want to see a condition / disease in a very concise format. I only use the nursing books for information on nursing care.
And absolutely do not miss too many workouts. I plan on hitting the gym 5 days a week (cardio or weights), and I consider it a success if I only get there 4 days. But any less than that and I start to feel run down plus my brain doesn't work very well. Also consider energy drinks (including coffee) carefully before using them - I use them frequently BTW - and plan accordingly so that you don't crash during a test.
Organization is key. Nursing school, even an accelerated program, isn't very difficult. What is difficult is remembering what assignments or reading is due when, when all your different tests will be, and when to schedule time to do your clinical paperwork. Also be sure to work smarter. If you clinical faculty are progressive enough to let you turn in care plans
from the Ackley online generator (with tailoring to fit the patient, of course), then you can focus more on learning the material as opposed to doing paperwork (for the sake of paperwork or "tradition").
Don't be afraid to stand up and say, "Hey, doing such-and-such busywork is taking time away from me to actually learn the material!"