I have a 3.2 cGPA and sGPA. Strong upward trend (it hovered around 2.9 in my freshman and sophomore year but really picked up to a 3.7-3.8 the entirety of my junior year). I have a 30T MCAT.
As you can guess, a lot of my core classes like ochem and biology received C's and low B's. There are a couple of reasons why these early grades were bad - I was working on losing 80 pounds and overcoming obesity, I was coming from a small town to a gigantic university, I took on a full research load during freshman year which sucked up a lot of time, etc. But honestly, these are more excuses than solid reasons. The truth is... I just didn't have much motivation and good study skills until junior year, when I really got my rear in gear and started achieving stellar grades.
Now I have an interview with a school known for specifically asking questions about bad grades. I'm sure they will ask me to justify all those C's in biology, physics and ochem. What am I supposed to say? I don't want to lie and pretend I had some huge anchor holding me down, but I also don't want to say "eh, I just didn't try hard until junior year". Help.
EDIT: Let me emphasis how bad my early grade situation really was. I literally had B's and C's in every single bio, every single physics, and every single chem/ochem class during those two years. It's so mediocre that I'm surprised I even got an interview from a school. So I know they'll try to focus on that.