How do you get the Audi R8 on Midnight Club Los Angeles?

Go to the Rockstar social club on the internet and sign up for an account. At the end of the sign up, you will be able to link your Rockstar account with your gaming account; do so.

Go to the driver test section of the social club, and set up the test. Complete all 12 tasks to get the Audi R8.

4/12 Tasks done: Air bags and Hydrolics unlocked.

8/12 Tasks done: 8 Pack of Rims

12/12 Tasks done: Audi R8