Actually,it kinda depends. If you're a racing god after playing GT2 37 hours a day since it's release, then yeah, all of the tests seem easier. Me, I'm just barely above average in skill.
Having said that, the B and A licences are a cinch, the IB about the same, IA a little tough though not very. Most of the S license is about the same difficulty as the GT2 S license except for the final, S-8, which is a BITCH.