In a car race, you win the biggest share of the reward money once you get the first and the rest of the racers gets lesser money than you. After that, you and the other racers are free to join another race, but in this game, you can join once you land in the last position. As you move along in the game, you need to make sure that you won't be in the last position since you will be knockout in the preceding races.
Drive your car as fast as can till you reach the finish line for the third time. Use your booster to get ahead of the rest, but you need to understand that speed is not all in this game since you need to turn and you can't do that if you are very fast.