Yes it is the only challenging test, but you will get it in the end.. sadly even if you end up on your 4 wheels but the landing was on two and then you had some problems to stabilyze the car, you get 0%.. the trick is to really hit the ramp as close as possible to its limit and hope the car will complete the rotation before hitting the ground.. you will then get 100%
I think I also gave a little steering imput before leaving the ramp when I made it, can't remember if it was to the left or to the right though