Learn Tracks
If you have trouble with races, go to time trial. Select to face with nintendo studios or retro studios. Follow them to learn the ways of the track and shortcuts. If you see other choices from spotpass or streetpass that are faster, follow them for a faster time. Then you can become good at your races. (online vs can also help for learning)
We have more cheats and tips for this game here, Mario Kart 7 cheats
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