I'm on Hard difficulty, so at least that might explain it 😅Which difficulty are you playing on? I am on Normal.
I just golded the A-10 Master License - still got 2 silvers to clear, which will probably take forever as I hate the Tokyo track with a passion.
Some of these licenses are incredibly hard to gold, but a few others are very easy.
A-10 was pretty easy, but it's also one of my favourite sections of track in the entire game (last sector of Autopolis).