Bet on any of the ten races that you want. Your money total at the end of 10 races will be your score.
You must bet using only one player's wallet. You must race ALL TEN races and get to the final score sheet that is on a green screen - after the 10th race is run. Your score for this track is not your "peak" score. It is the amount in your wallet that is indicated on the green screen indicating your final money total.