I would be most interested in math, because of my interest and knowledge in math. If I had to make a second choice it would be Biology. These two subjects are both my highest scoring classes, and are the ones I love the most.
Math and Chemistry are both subjects that I am passionate about and I have competed at regional and/or national for both. Perhaps other subjects such as physics could be introduced some time in the future as well? I would happy to write problems for these subjects.