The C is found in the early shortcut at the start of the track. Jump down to the second step, then hop right onto the curved stone driveway. The C will be here. The T is located at the end of the ...

The second shorcut is located in the bridge section. After the first turn and over a ramp, there'll be a second ramp with ? Crates. If you jump left off this ramp you can land on a second, thinner ...