You have to choose flying club in the menu before you continue your game to select one of the three matches with the other clubs. There isn't really any trick that I found, you just have to fly through the middle of as many stars as possible while not missing any so that your combo score is also high. It seems trial and error is the only way, hufflepuff was the hardest for me because there aren't as many stars to fly through so you can't miss any.
The training dummies add time to the clock, so if your stars are flashing red because you're low on time then hit them. Otherwise, there's not really any point to hitting them because I always got 2,000 points as my time bonus for finishing without a retry. I think you lose 500 points from your time score for every retry, I guess that keeps you from five-starring a run that you failed four times.
I've asked this in another thread, but no one there seemed to even look at what I asked.
What does it take to get 5 stars in the flying events?
I've hit every single star goal dead center several times and the meter fills all the way to the top and keeps counting but I never get 5 stars. It's almost like the game is glitched in the flying event where it can't give 5 stars or something.