Select Expert class and finish in first, second or third place in all five courses in any of the leagues.
Fully accelerate and press Right before the start of the race. Most cars (except the Golden Fox) can get a boost by being hit from behind by the next car.
Press L or R while racing to move right or left slightly. This will help return your car's balance.
Hold L while turning left, or R while turning right to make a tight turn.