I'm afraid from the studying point of view, the world is very fixed-wing oriented.
You will find that the Air Law exam also has a helicopter specific bias as well as Principles of Flight and Flight Planning and Performance.
I would recommend Wagtendonk's book for Principles of Flight. As for Flight Planning and Performance? It seemed to me to be a bit of a "catch-all" exams covering stuff that doesn't appear in any other syllabus. I managed to wing it using a mixture of common sense and what little flying experience I had at the time!
You may well have a case for a partial refund from the CD-ROM supplier as they didn't describe the contents and purpose fully - perhaps enough to buy Wagtendonk's book?
Cheers
Whirls