GMAT Official Review Edition 13 Much Harder?

Thanks for the interesting discussion! The OG 13 was not designed to be more or less difficult than previous editions. After we release a new edition of the Official Guides, we frequently hear from students who feel the updated version is more or less difficult than previous editions. The guides are always designed to include questions from all difficulty levels. The major change you would see in this new OG edition is the inclusion of the Integrated Reasoning questions. As always, the difficulty level of the questions you see on the Quant and Verbal sections during the GMAT exam is determined by your answers to the questions in those sections, as per our CAT format. I hope that clears things up!