True. I'm French native but my English is better (educated in Australia) so this created a weird situation for me where I got 14/20 for advanced words and 19/20 for expert words.

To be fair, I think I messed up a few advanced words by accident but I think the general pattern would hold because many of the expert level words seemed to have French root. So it felt like it got easier towards the end for me. Grandmaster words were a bit weirder on the whole.

I'm an engineer and read mostly non-fiction so this probably explains the gap too.