Your goal is not to arrive the first, but you have to win the more points you can. You'll have to do wheelies, flips, andjumps to get more points while you overpass obstacles.
In the career mode, you will be able to buy items and powwer up your moto with the points you earn. That will make your moto to be better and will boost up the possibilities to win more points.
Mario Moto is an amusing game and it is free, so download it an play.