Here are some hints:
Sharp Corners:
When taking sharp corners, follow this pattern: decelerate, brake and turn, 
then accelerate and straighten out on theway out of the bend. Stick to 
the "behind-bike" viewpoint. As nice as the "in-head" and close-up cameras 
look, it's easier to play from a far. 

Watch Replays of Races:
Looking at telemetry information during replays, it's easy to spot mistakes 
and learn new 
techniques.