Sometime around the second year, you start becoming lazy.
When you reach the third year, you kinda stop bothering much and everything happens in an vague inertia. You submit projects and write exams without giving either much thought.

In your fourth year, you hit the extreme lethargy button. You just can't get yourself to do anything. It's like nothing works on you- the carrot of marks, the fear of flunking. You avoid work while you can, for as long as you possibly can. You stretch laziness to new limits. The worst part is the utter indifference you feel. You just don't care! I am in the fourth year, and still struggling with trying to get myself to do projects. Hence... :)