Help!!

Hello everyone my name is Ernest. Let me tell you guys a little bit about myself. I'm a 17 y/o pre-nursing student (college student doing pre-reqs for Nursing Program). I finished high school at age 16 with a 3.5 gpa. I'm currently attending a community college in Palm Springs, CA. I wanted to be a doctor (pediatrician to be exact) since age 5, but it's too expensive and it's too many years. So I decided that I wanted to be a RN. Last semester fall '16 I took English and math, but this next semester spring '17 I'll be taking Basic Pharmacology, ECG Interpretation, General Nutrition, and a course called 'Your Living Body'. I'm very anxious to start this spring because I don't know if these classes are easy or hard (I don't mind if they're hard classes because I love studying). If any of you RN's, LVN's, or Pre-Nursing Students took any of these classes, can you please give me insight on what will be covered in the class(s) and any study techniques you used to study for this class? Thanks in advance!!

-Ernest :)