Paramedic school prep
I'm a paramedic instructor for a national college for Emts and paramedics, so I see all types of students. The students that start paramedic school with some experience will usually have an easier time in their internship. I've seen some students fail because they are overwhelmed, but then again my best intern was one with no experience. He worked harder than anyone I ever met and studied all the time.
So, if no experience as an EMT then you should study pharmacology and learn to read an EKG rhythm. Try to get the paramedic books early and start reading them. Your class will go over what you have read and it will easier for you the second time through. Get an EKG for dummies and that will make cardiology easier. But cardiology is what makes a paramedic, so I would overcome your weakness.
Most importantly, give yourself enough time to study and work in study groups when school starts. Don't get overwhelmed and take it a one step at a time. Good luck