For study and practice all in one place look no further than CGP's fantastic Complete Revision & Practice guide for Edexcel AS and A-Level Business.
It's packed with clear, straightforward study notes on everything you need to know, plus plenty of helpful examples.
Practice questions and exam-style questions are included for every topic (with answers to the numerical questions).
There are Maths Skills and Exam Help sections at the back of the book - with some worked exam questions to make sure that nothing comes as a shock on exam day!
There's even a free Online Edition of the whole book - just use the code printed inside the cover to access it on your PC, Mac or tablet.