Opponents
The light blue cars are not actually opponents, and do not affect how your will finish. They are simply placed as obstacles. Focus on the purple, orange, or white cars, as well as those that are blue but are not the same light blue as neutral cars. When hitting those types of cars, try to keep up with them. During turns, try to get through them the best as you can, and allow collisions with other cars to send them out of bounds slightly.
Turns
Stop accelerating when a turn is approaching. Allow your car to take the turn automatically. If you have dropped enough speed, your car should take the turn well. Hit the accelerator again as your car finishes the turn to get back up to speed.