MXGP - The Official Motocross Videogame

To get promoted to MX1 class you need to play xbox live - Online season

In this game mode you have four races of three laps on a random track to win 72 points by racing vs other player and AI players you get:-

1st - 25 points
2nd - 22 points
3rd - 20 points
4th - 18 points

so playing VS other people can be quite a challenge as there are some very good players.

But there is a bit of an exploit to help you.

First search for a game if you get put in a lobby with other quit out and search again until you are the host of a lobby. Then wait for one other person to join the game and because you are host you can kick anyone else that joins. This make placing second in the race VS the AI player very easy and getting four second will get you your promotion.