In the last race of the first cup (Bikini Bottom Blowout), take a sharp right turn after going through the second cave & passing the turbo boost right after it. Doing this will let you skip the big turn at Jellyfish Fields and save you a few seconds (I don't know how many). When you get in there just go straight and then turn left when you get out.
On the third track in the third cup (Grity City Circuit), when you get into the park with a sign above the entrance, take a left after the first turn and there's a shortcut that should save you a few seconds. Right when you get out of this shortcut, just keep going straight for a second and you will find another small shortcut. This should take about all the way through the park. Note: these shortcuts are bridges.
On the Reptar Raceway, start off and after the first turn take a sharp right then there will be a cave go through there and it will save you a few seconds. On the second race in the second cup (I forgot what the name of the track is) When you go into the tunnel and a sign above you says COLISEUM take a sharp right and you will go through the real coliseum and this shortcut saves you about seven seconds. In the last race in the third cup (I forgot the name) when the first intersection comes take the left. Then drop off the first jump and the entrance to the top volcano level is there. You can also try the second jump I've never tried it yet. Unfortunately, These are all the shortcuts I know.
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