Select 100m race. In the options to the event turn difficulty to easy and turn game mode to arcade. With these settings, the race can easily be won so maintain speed inbetween 4th and 2nd place. Once the race finishes a message appears saying try again, select yes and repeat process.
NOTE: You will recieve 100 points per event no matter what place you come during career mode so if you want to kill two birds with one stone try getting these places during career mode as at the beginning of career mode it's very hard to place high until you up your stats. You may have to go through a section more than once to pass it.