For theses challenges, you will have to fly through a series of stars and collect all of them for a gold within the 3:30 time limit. I recommend using the Icon A5 as it is extremely maneuverable and slow enough to avoid hitting other objects such as buildings. For the first 2 challenges, the quickest method is probably to circle the level collecting as many points as you can on each pass. For the last one, it is recommended that you first collect all the rings around the buildings near where you start. Then, move onto the ones next the the battleship, followed by the ones at the bridge, and finally the ones at the road and between the rows of trees.