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

Shortcuts:
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.

Bonus Cars:
There are four bonus cars in the game. To get them you must beat the Basic or Pro Series on Arcade Mode. There are 6 different cars to get.

To get the first four you must beat every arcade mode scenario.
To get the other 2 secret cars, which are the best in the game, you must beat Championship mode on both Normal and Expert.

The bonus cars are:

1. Ferrari Testorosa
2. Porsche 959
3. Vector
4. Dodge Viper
5. Bugatti EB110
6. Ferrari F50