I have an incredible amount of respect for anyone who decides to become a high school teacher because I can't imagine anything more daunting than being tasked with getting teenagers to genuinely care about anything on a daily basis.
This is especially true for teachers who are forced to deal with seniors entering the home stretch of their high school careers, especially when most of them have already been accepted to colleges and have no real incentives to try any harder than is absolutely necessary.
With the exception of the kids who care way too much about becoming valedictorian, the last few months of high school can be an absolutely torturous time for the students who have already checked out mentally, which is why it's extremely important to figure out a way to stay occupied until graduation.
In my opinion, the best use of this time is to plan a senior prank.
If you weren't a star athlete or stellar student, there's no better way to leave a legacy than coming up with some sort of stunt that people will talk about for years after your graduate.