Now that you've earned the gold on all of the previous National B License Tests in Gran Turismo 5 on the PlayStation 3, you have one more to go— the lap battle (B-10) at the Indianapolis Motor Speedway. If you still haven't unlocked these tests, just buy your first car and start driving… um… racing!
B-10: Indianapolis Motor Speedway 1 - Lap Battle
Similar to the previous test, [/how-to-video-413637/ slipstreaming / drafting] is also CRUCIAL here. Without adequately drafting the other cars you will NOT win this race.
Other than drafting, just be gentle in the corners (no abrupt turns) and you should easily win this after a couple of tries.
Note * Played with a regular six-axis PS3 controller.