Beating staff ghosts
To beat the staff ghosts, make sure you have a kart with full top speed. This is essential, because it might help you catch up with the staff ghosts if you fall behind. Also, you need good acceleration. This determines the size of your mini-turbos. Finally, the items stat is important, because the higher it is, the more mushrooms you get at the beginning. More mushrooms=more shortcuts. You also need a lot of practice. My favorite kart for beating ghosts is ROB-BLS.
More tricks, tips and cheats for this game are right here - Mario Kart DS cheats
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