Also, bonus tip: you don't have to do every assignment or even all of an assignment that you do. In most of my classes non project assignments were a pretty low percentage of my overall grade. When I was particularly pressed for time or stressed I would just do enough of an assignment to prove to myself that I understood the concepts good enough for the exam, and turn in what I did for partial credit.
Also, bonus tip: you don't have to do every assignment or even all of an assignment that you do. In most of my classes non project assignments were a pretty low percentage of my overall grade. When I was particularly pressed for time or stressed I would just do enough of an assignment to prove to myself that I understood the concepts good enough for the exam, and turn in what I did for partial credit.