First thing I can recommend is during the exam, to really read the question. While PSM I had very straight to the point questions with relatively different answers, PSM II has a lot more white noise in the questions and answers that look rather similar. So focus on what is really being asked and filter out any false answers.
Second I can recommend to really fully read and understand the Scrum Guide and Gunther Verheyen's "Scrum - A Pocket Guide".
Third is to answer the questions according to the Scrum Guide instead of an experience point of view. Maybe the way Scrum is being used in your organization is different from the way it was intended. Answering according to the SG will help.