From the Super Mario Wiki
Point-boost tickets are items in Mario Kart Tour used to increase the base points of a specific driver, kart, or glider by providing 50 experience points to it. If the driver, kart, or glider has already the maximum number of base points, no further point-boost tickets can be used. Point-boost tickets can be obtained from the shop for 100 coins, from Tour Gifts or as award for ending in first, second or third place in a ranked cup.
"Race a driver's/kart's/glider's base points."
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