why not ask this question on the bristol ground school forum?
You'll get a more specific answer on there
as for mod 2, In my opinion mod 1 was harder because it was more problem solving based whereas mod 2 is more factual.
u know what to expect this time round on the brush up so u have a better edge there this time, but as for the whole course I'd say gen nav was hardest, but for mod 2 performance is difficult - but not as difficult as gen nav