From the Super Mario Wiki
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The Minis begin along the outer edge of the "U" shape the level consists of, with the various exit doors along the same edge. In order to reach it, they must simply be guided via a series of Red Girders and Green Pipes to them.
The M-Token is located at the top left, just above the Mini Peach door. To collect it, the Mini Donkey Kong must follow a Red Girder slope to it from its starting position.
Mini Mario Card
The Mini Mario Card is located near the middle right, atop a platform below the Mini Peach's starting position. The Mini Pauline must follow to it from its starting position to reach it.
In order to earn a trophy, the player must score 15000 points.
In Plus Mode, the Mini Mario must be guided to the exit door first, followed by the Mini Toad, then the Mini Peach, then the Mini Donkey Kong, then finally the Mini Pauline.
In order to earn a trophy, the player must score 13900 points.