Okay, this one sounds so cliche, but I promise it works. Whenever mid-semester hits, I find myself losing motivation. To combat this, set goals for yourself, both short-term and long-term ones. They don't have to be HUGE, just small road marks that you can achieve. For example, sometimes I tell myself I need to spend 30 minutes reading over my notes, or to grasp a particular theory this weekend, or write one paragraph of my next assignment.