I have gotten the revision kit valid until june 2015 can I use it to prepare myself for the exam on june 2017? or rather buy the new version? are there many changes? Thanx for the info!
You should buy a new edition. Not because there have been so many syllabus changes (although there have been some) but more because the format of the exam has changed a lot (now with three sections and more MCQ’s).
A current edition of a revision kit will have lots of questions in the current exam format.