Words of advice:
Before swimming, start a game and gather 8+ fish, then restart and via some glitch you'll get a School's Out! and 16,000 points as long as you leave the water quickly.
Next, when you're about to do your winning jump, tailslide and hit up on the arrow keys. Keep doing corkscrews and if you hit starslides, hit up on the arrows and you'll be catapulted upwards. I've made it as far as "Wizard's Eye" using these tricks.
I think that's because a little in (around the C grade area) it tells you that the triangles are squares. So it's got the collision properties of a square, even if you can only see a triangle. Part of the challenge.
 "Take Something Literally"){kind=icon}
 "Dolphin Olympics 2"){kind=icon}
 "Stick Avalanche"){kind=icon}