I golded all the beginner and intermediate with a controller, took me a while though as it has to be perfect pretty much.
If you have to adjust the analogue stick anywhere in the turn you can pretty much assume you won't gold it, just learn where the stick needs to be, get it there at the turn and keep it there, and hope it's right.
I found the ones on the track without a bank (where you have to brake or at least lift off the throttle) alot easier. For me that came down to finding the point where I can use max throttle coming out of the corner.