I find with some of the tests it is good to write the code out and correct it to make it work. It’s practice in writing the code and seeing how Xcode works. It can confirm to you that you got the right answer.
There are daily challenges aside from the learning. Some I can’t do because I haven’t got far enough in the learning side of the app. You get points in these challenges completed added to your total. Makes it a game and help you feel like you are winning.