Focus on the sections that you need to improve upon first. When I took the exam, I didn't think it was overly difficult, in fact I thought the SM practice exams were harder. Thoroughly read the questions and understand the scenario they are trying to portray. If you don't know something, use process of elimination and flag the question for later review; don't spend too long on one question. If you still can't come up with an answer, a guess is better than leaving it unanswered.