F5

Good day Sir
One of my friend appeared in paper f5 june 2018 exam and said that the paper was disastrous and tougher than expected . questions were not as in the ACCA approved Exam kits or as taught in the lectures and notes etc.
It kind of scared me since i plan to appear in F5 sept 2018 and i will start preparation from july 2018 ( as right now I am preparing for paper F1).
First I want to ask why is f5 difficulty level so high and how should i study to make sure I pass?
Secondly, I want to ask is it possible to prepare for f5 paper in 2 months only?

Your guidance will be much appreciated,
Thanks in advance