A PDF revision guide for AS unit 1 and unit 2 can be downloaded here: Revision Guide 2016 Note: Please attempt practise questions AFTER doing actual past papers found here
All the past papers for unit 4d Global Politics in one PDF can be downloaded here
All the past papers for unit 3d Global Politics in one PDF can be downloaded here
Download a PDF of all Edexcel 40 mark questions (2009-2015) here
Download a PDF of all past Edexcel source questions here
A modest revision guide I prepared for Woodhouse Politics students, with the specification and example questions, Revision Handbook
Here are my Keynote slides (downloadable in PDF) for exam technique when answering unit 1 and unit 2 questions. Please note the style of writing is not prescriptive and students are encouraged to develop a coherent style of their own.