I've golded all of A, B and IC-1 and 2. I'm on IC-3 at the moment. I'm using a G27.
General Tips (as others have said):
1) Always disable traction control, I usually leave ABS at 1
2) Don't follow the stupid driving line (if you're trying to get gold)
3) Ghost car is your friend!
Specific tips:
IC-1 1000M Stop test in the Aston Martin - Had a bitch of a time, must have tried this 30 times. I was within .020 or .040 of gold almost every damn time, adjusted braking point a gazillion times, improved shifts every time, just could not get the damn gold time! Finally I tried it with the ABS off and E-Brake and a little sideways stop at the end, got gold and beat the required time by a tenth on my 3rd attempt!
I was happy about that one.
I also find the licenses to be extremely easy as compared to previous versions, I don't recall ever getting this many golds before. Quite a few of them I've got on my first or second attempts. IC-3 is proving a little difficult, have probably tried 10 times but I'm getting closer and closer.
I've only tried the online racing once, have done a few A-spec and 1 B-spec event. I love B-spec for being able to sit back and use the DS3 controller from my couch when I don't feel like jumping in the cockpit.
Congrats to all you guys with 60 golds, I am envious!
Hope to be there soon.