If you're having problems with the AMG tests, all I can say is practice, practice practice. I spent hours on the Beginners Class alone. Keep track of your times and speeds coming in and out of the corners. Note what the times are at certain points in the course and try to keep, or better, that time on each run.
I know I restarted many, many times, just 'cause my time at a corner was not where it was supposed to be.
All of my races are done using the DS3 controller.
This video was recorded using a Sony digital camera