Skipping class sometimes is something we all do, as is not finishing all of our work or reading. But it didn't used to be like that!
In high school I was such a good student until I figured out that I didn't actually have to do all of the work I was supposed to. That was both awesome and bad. And so when I came to Columbia fresh off doing just enough to get by my senior year and chilling all summer, my work ethic was less than great.
I waited until literally the last minute to turn in my physics homework (like serious sprinting to Pupin last minute).