I think you might like this book – “New 2015 A-Level Economics: Year 1 & 2 Complete Revision & Practice” by CGP Books.
Start reading it for free: http://amzn.to/1SIhoCn
Kindle Apps for pc-tablet can be downloaded at the Amazon Store and Apps at the Google playstore (and I-phone store): a version of any book with a kindle version can be purchased, downloaded and then synced across devices!!
Slideshare have an app too; but you could just bookmark their website. With smartshortcut apps for android, you can turn Google website bookmarks into groups of apps.