Better weapons, extra points, class advancement:
Win a medal on each level in a class (C, B, or A) to earn extra points, better weapons, and advancement to the next class (B, A, or AA).

Hint: Faster parts selection:
Repeatedly tap A when the CPU is selecting a part to take from you. This may also increase the chance of nothing being taken.

Hint: Always trade parts:
Enter parts options screen and enable "Steal Parts" and "Trade/Swap Parts". The CPU will always trade instead of stealing your parts.

Hint: Quick start:
Accelerate just before the last light turns green.