I've got my last exam (Perf) on Oct 1st. I'm with Bristol averaging 95% in the 13 passed first time so far. If you have read the books, and hit bristols online question bank hard, then when you go to the actual exam, you've seen +90% of the questions before.
Don't worry, exam is far easier then the Bristol Brush up. That's why bristol is so good.
HB