I used the confuser to revise for all my exams and got 96% or better in all of them.
The questions are similar but it seemed to me that there were always a couple that wern't in the confuser, but if you have studied trevor thom then you will probably have a good chance at those too.
my advice is study T.T. and self test, then do the confuser untill you get 100% every time then go for it.
You will be fine
