Sure, here are some tips to not fall off the circuit, some suggestions include:

Taking turns carefully and avoiding drifting off the edge of the track
Making use of items such as mushrooms or stars to increase speed and help maintain control
Practicing and learning the layout of the track to anticipate and avoid hazards
Staying aware of other racers and avoiding colliding with them, which can knock you off the track.

It is also worth noting that the exact design and layout of Rainbow Road can vary between different Mario Kart games, so the specific version you are referring to is not specified.
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