I didn't get a chance to read all of your songs yet but I skipped around and so far I liked: Somewhere, Adrift and =D olly.
Will you be playing an instrument while singing?
If its an option, do it. It will help set you apart from the rest of the competition.
Now if your going to play piano and sing which one do you feel most comfortable doing?
Which one do you feel is your favorite or best one?
These are Questions to ask yourself but I also want to know what you think
And I would go into competition prepared with two or three songs.
Your writing is great! Your voice is amazing! You can win. I wish you the best.