From the Super Mario Wiki
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Both Minis begin on the top right, with the Mini Mario door on the top left and the Mini Toad door on the bottom right. In order to reach it, the two Minis must be isolated via placing a Red Girder bridge down just before the Mini Toad reaches it, then having both Minis enter the Warp Pipe simultaneously. If done correctly, they will be led right to the exits.
The M-Token is located at the middle level on the right. It can be collected by drawing a Red Girder bridge over to it and having the Mini Toad collect it just after it exits the Warp Pipe a second time.
Mini Mario Card
In order to earn a trophy, the player must score 14800 points.
In Plus Mode, the Mini Mario must be guided to the exit door first, followed by the Mini Toad.
In order to earn a trophy, the player must score 14100 points.