By senior year, many people have decided on their post-high school plans, whether it's college, the military, or going straight to the workforce. People at my school have found creative ways to lessen the symptoms. Quite a few take only required classes and leave halfway through the day. Others doubled up on requirements and graduated last year. For others, senior year is a mad dash to cram for AP courses in the hopes of saving money at college in the fall.
Graduation is the obvious cure.
However, looking forward to special events such as prom and senior trip help to ease symptoms. Please, be considerate of your fellow seniors. We're all in this together. At this point you have to want to do well for your own satisfaction. You don't want to do any more work and just want to relax or not even be at school anymore.