WWDC scholarship app requirements?
The app needs to be an interactive CV/Resume that shows off your creative and technical ability, but also talks about your background and projects you've worked on. Submitting an app you've already made that serves another purpose isn't what they're looking for, though you can (and should) submit links to other pieces of software you've made in addition.

More detail is given in the scholarship requirements section 1: https://developer.apple.com/wwdc/scholarships/Scholarship-Guidelines-and-Terms.pdf

Good luck!