Beat the Championship Mode in Novice and Expert difficulty levels, and you will receive reverse tracks. 

Bay track (with the tanker in the water)

Start the race, then after the first 4 or 5 curves, you will come to a long bridge that gradually rises. At the top is a sharp turn right, then you run into a t-junction and it tells you to turn sharp left. You can go right here, and save a few seconds, but either way you go you end up going around the building and continuing straight. As soon as you get to the track on the other side of the building, look on the right wall for a yellow iron gate. Drive into the gate and take a right, then a left turn. When you turn left, keep turning until you see a dark gray iron gate just like the yellow one, and drive through it, then turn right once you get out to continue on the normal track. This will most likely put you in 1st if done quickly.

First course of the pro series

After you start the race, you will go through about 6 or 7 turns and then hit the S turns. Go through them and then there will be a yellow right hand turn and then a red left hand turn. Then there is a short straight-away. It says to go right, but instead go straight into the mountain. There is a patch of grass, and you go in right there. If you do it quickly you will go into first place and take seconds off your time.