Which Computing book i should buy

[mohsinksa]

Hi Every one
I am new to appear A level Exams in June/July session in 2013.I have following subjects to Appear

Computing
Maths
English

When i went to Bookstore i got Computing book .I don't know that the book is for Just AS or Complete A level .How to prepare my self for computing subject because i am not going to attend any tution i have to prepare computing by my self .
Please help me that which lessons in the book are for AS and which are for A2

Please help me

 

[Master Minds]

buy the one endorsed by cambridge university. whereas i know, the as topics are marked in book content list ot u r told in the intro of the book that which of them are as topics.