I got a little cheat that will guarantee that u always come #1 in the
arcade and tournaments (only works in total racing, and non-knock out
races). All you have to do is look for a place with weapons and camp
there. Then fire weapons at cars that come by. Worried that if the other
opponents finish u dont get points, well that is not so. The opponents
will keep on coming by u until u finish the race, so keep on collecting
weapons and firing. The opponents no longer shoot each other once they
finish their race so they dont get extra points. I find that a total of
30000 is usually sufficient. then just finish the race.

I find this good with tracks that are impossible to race on.