I was pretty confident that i passed stage 1 after i did it. However i did feel i did well on all the papers except the cubes. There is simply no way of knowing really as no-one can tell what the pass marks are. A stat for you though, 90% fail stage 1.
Good luck!
P.S. Stage 2 i wasn't confident i had passed but i did so don't think too much into it!
Seb