DKProbe - to get the bird on the first level you have to do a sliding double jump from the middle platform at the bottom to the side of the platform that the door is on, wall jump off that to the other side, wall jump off that onto the door platform and double jump up to the bird before it flies off.
963m.
-Have max jets, wheels
-Make the cart as flat as possible when it hits the ground (seems to rebound better and pick up speed)
Easy.
For hard badge, try to get as good a timing as you can at the flags. If you get good timing the cart gets a natural backwards rotation. Start handstand as soon as you leave the ground. When you get natural rotation allow it to spin such that the rocket is facing directly downwards until you get high into the sky and can see stars etc. When you start to descend, backflip the rest of the way and hop in trolley before you hit the ground. 2k+ points for tricks.