Papaya Grove>Avacado Roller
Game Mode must be Dragster
Then select Medium and choose 3 racers.
Papaya Grove is less than a minute long. Stick to the red strips where you can for the most speed, green is average speed and blue slows you down so only cross it when you have to and quickly.
I found this random as shit. I won the first 6 in a row, then lost the next 5, won 2, then lost 6, then finally won the last 2. It all depends on if the AI decides to shoot you or not but as I say, the course is short and you'll get it eventually.
You can choose restart after each race ends, no need to quit out each time.
If you have another controller you can join the race as a local second player and this will eliminate a random AI driver and it's associated lucky item wins designed to punish you at the last minute, basically leaving you to race one computer controlled driver instead of two. As a bonus you'll unlock: