Book for IMC theory exam
 

Is it this one ?

Also, why is it called a "confuser" ? Surely that's the opposite of what the book is attempting to do ?

That's the one.

Yep, that's the one. I found it very useful.

You could also try downloading software from Dauntless Aviation

I've no experience of the IMC software, but using other software which they produce, I got first time passes in FAA CPL, Instrument and ATP exams over the last few years.

Good luck!