This seems to be an issue with results bar on the right, because moving the view to a separate file in Sources (press Command 0) works fine.

Yes, a student id is fine as long as it "clearly shows your name, the organization or school name, and the dates for which it is valid." Be sure to also submit the contact information of a member of your school's staff.

It says "all models of iPad Pro" here - https://developer.apple.com/wwdc21/swift-student-challenge/, so I'd assume that's 9.7 inch too.

Do you have a mentor / supervisor? You could write down their info. Otherwise you could ask your teacher to provide the dean's contact info, or just look if they provide contact information on your school's website.

Last year that worked for me!

Just for the lazy people out there: twitter.com/EEhare/status/1383569452134932486

JSON above is not/no longer working...