I'll be honest with you just for the sake of it even though its embarrassing for me.
I am in my first semester. I have been doing great with clinicals and labs, fundies I am just getting by but that's BECAUSE of med surg 1. I literally pour every ounce of focus that I can into it because my first exam I did AWFUL. Like not even regular school passing (56%) it knocked me on my butt I will tell you that because I REALLY did devote so sooooo much time to it and did billions of practice questions. The second test I focused more on reading and making my own notes along with the lecture notes. I improved but still got a 70%. I felt SO discouraged. I questioned EVERY THING for a long time but I have worked SO hard to get where I am, as I'm sure you have. We arent stupid if we made it into the program. You are at a point where you need to decide if this is what you truly want and KEEP going. The third exam I did the study guide, I read and highlighted in chapters, I did practice questions, my friend and I randomly texted questions to eachother and went through rationales. I really took my time taking the test. I went back through and made sure I REALLY READ what the questions were asking and I ended getting an 82% on that one. My school is the same as yours, 75 staying alive. So right now I have a 70 in that class BUT the point is I decided I wanted it, decided I was IN and kept trying to evolve and adapt my study habits to help me get there.
Nursing school isn't easy, it isn't anything that is going to be given to us or else EVERYONE would be doing it and passing. It's okay to have your down moments, that's absolutely needed some times but if you are IN THIS, dust off and keep going. Do not stop and do not doom yourself by thinking you are too stupid to do this. You're not, or you wouldnt be here to begin with. Best of luck to you.