On the requirements page, it details that "Your Swift Playgrounds app project must be built with and run on Swift Playgrounds 4.0.2 on iPadOS 15.4 or Xcode 13.3 on macOS 12.3." I was previously building my project in the Swift Playgrounds app for mac, which had certain features like PlaygroundSupport that I could use. However, if I'm building it in Xcode 13.3, these are not available to me. Am I allowed to build it on the Swift Playgrounds app (does it matter?), and how can I know that it runs on iPadOS? Still new to this whole thing (started learning Swift a week or two ago), any advice appreciated. Thanks.

For eligibility, Apple says that the student must "be registered for free with Apple as an Apple developer or be a member of the Apple Developer Program," however from what I've looked into, the Apple Developer Program is for those that are 18 and older, and requires a $100 yearly subscription. How would I go about joining this program if I am under 18 years old, or am I looking at the wrong thing? How do I register for free with Apple as an Apple developer? Just a bit confused and want to get it sorted out before it gets close to the deadline. Any help is appreciated. Thanks :)