If you don't have anyone to boost with, heres a guide!
a) Go to Xbox Live lobbies and look at a few peoples record and streak and DNF.
b) If it all looks easy to win for you, challenge them.
c) Pick teams that have at least 2 3 point shooters. (You can easily figure this out, the only won I can remember right now is Kentucky, and they have 3)
d) Swing the ball until they have an open 3, take it and normally I make around 70%.
e) This can get very annoying because half the people you play with leave if your winning!