I took the test three days ago and I definitely felt that actual exam was more difficult than the questions in
the official guide. There seemed to be a lot of word (this seems to be consistent with what I have also heard from other people that have recently taken the test). I confronted one intermediate probability question and one very basic combination problem. Make sure you understand the basic concepts for comb/perm/prob, but don't over do it.
That being said, it is hard to say whether the questions are that much more difficult than the
OG. Under real test conditions the questions might appear more difficult than they really are. Also, its easy to look back at questions that you worked through and say that they were easy. What I mean by that, is if you never looked at
OG questions and confronted them in actual testing conditions they will probably be more difficult than if you worked through them in the comfort of your home without the test pressure. Afterall, all the questions that you see in the
OG were formally actual test questions.
The one piece of advice that I can give you (for quant.), is to thoroughly understand the underlying concept in each and every problem. Reviewing a mistake thoroughly is much more important than answering ten questions right. Good luck.