Which CGP books shall I buy????

This is for AS level OCR Biology
Shall I buy the complete course with exam questions book??? Or the one with just revision explanations, like I can find my own exam style questions but I'm wondering which is the better buy??
Complete course + Exam questions- http://www.amazon.co.uk/New-2015-A-Level-Biology-OCR/dp/178294320X/ref=pd_sim_14_6?ie=UTF8&dpID=51gloETPn3L&dpSrc=sims&preST=_AC_UL160_SR121%2C160_&refRID=1WZESSSABNG6NC9QNXKM

Revision Guide - http://www.amazon.co.uk/New-2015-A-Level-Biology-Complete/dp/1782942866/ref=pd_sim_14_2?ie=UTF8&dpID=51nhtLevBrL&dpSrc=sims&preST=_AC_UL160_SR113%2C160_&refRID=1768YJ05M443XRX2FVN1

Personally I'd go for the revision guide - it will be more condensed and easier to revise from, and then you can do exam paper questions from past papers