I have been using this book for the last 2 years in college, and am recently going to be resitting 2 ICT modules. In terms of the use of this book, I have obtained two grade D's (i.e. the ones I am resitting). For AS i used notes off the internet and achieved a C, and an A.
In comparitive terms to other subjects (Geog - A, and Business - A) I dont think it boils down to personal ability.
this book is very confusing, it misses some very important details off the AQA syllabus. It repeats the information several times throughout the book, mostly in the same paragraph (have found myself writing the same note on several occasions)and waffles terribly, instead of boiling down to what information is needed.