1. AFT is as good as it gets. You won't get any closer to the style and wording. Some questions are exactly the same ( even some of the big 5 markers ) but you may find the data ( ie.. wind, gross weight , distances ..etc) different in some of the questions.
2. Yes it happened to me and I used the latest ERCs so be prepared for anything.
3. The AFT questions should definitely be enough, plenty of revision tests and cyber exam questions that should keep you busy for weeks. I spent a month and a half in my local library just going through the book and Qs before I attempted the Cyberexm. There's a lot of good stuff in Nathans course notes.