I've also had several requests for help with revision for ENGA3, so I'll be running a few blog posts on this unit in the weeks to come.
But, given that you still have a good 7 weeks until the exam (11th June, I think) a couple of things you can do now are:
Read Henry Hitchings' The Language Wars (accessible, packed full of knowledge for your exam, and very funny too)!
Read Deborah Cameron's The Myth of Mars and Venus (as above)!
Go on: I guarantee you that these will help.
I'm also happy to take questions about this unit if you have anything you want to ask. I'll try to answer...