The Study Text is OK to use – the changes since 2012 have been fairly minor. (Although if you are using our free lectures then you do not really need a Study Text anyway!!! If you have one, it is better used as a reference book for any areas that you are not clear about from our lectures.
The Revision Kit is not OK – you must get a current edition. The main reason is because the format of the exam has changed and it is vital that you practice lots of multiple choice questions. The current editions contain lots of MCQ’s, but the 2012 editions do not.