It varies a lot. A lot of people on here are truly VERY smart. Look at all the 3.8+ / 35+ MCATs on here.
I think I'm smart, maybe a little more so than the average person, and I'm fighting for a B in o-chem. Our class average of over 80 people is a 49%, or a D by his curve. I got a 76% on our last test, which is just barely a B, and people were envious of me.
I'm not trying to scare you. I just want to make it clear.. most of the people saying it's easy or fun are smart! Either that, or they study an incredible amount. O-chem isn't too bad to tackle if you actually put in in the time. Unfortunately for me, I'm taking two other bio's, each with their own lab, an english class that is drowning me in tons of books and papers, and a physics class with lab. Every o-chem test I've had so far has been on the same day as my Genetics test and Physics test. I suck at studying for multiple tests 👎