This should be a fun essay for you to write. Sit down and pretend the only one reading it would be your future roommate and then write it. It is okay to be slightly informal in the language you use with this essay. You should think about what type of friend you would be and try to convey that through your writing. You want to bring up things about what you would keep in your room. It is also a good idea to talk about your habits. Tell the roommate what to expect. If you write this one truthfully, it will work perfectly!
These are some programs that are popular among high school students. This is by no means an exhaustive list of nationally recognized programs. Boy’s/Girls States