Im sorry to hear youre having a tough time, When I was in Nursing school, I went to my teachers, one on one, if I had questions.
Try to find your weak areas, also another idea, I used to come home after lectures, and re read notes, read from text on what we discussed that day in class. In the evening, I did @ 75 NCLEX questions on the areas we went over that day. It really helped me grasp things also.
I also didnt work as much, and ate healthy..still do, work out, still do lol, I struggled with semesters, had to repeat 2 different ones, it was not easy for me in Nursing school.
Also find a study buddy. Just keep it to another person. My study buddy is now my best friend!! We studied on the phone, it was fun and helpful.
Hope things get better!! Hang in there!!
Hope this helps