When taking the exam, you need to read the questions thoroughly and look at their grammar, especially if you are a native English speaker, as we tend to scan, and your answer must meet the objective of the question. Adopt a subtractive method by first of all ruling out the answers that are wrong and then selecting the correct answer; the hardest way to tackle this exam is to immediately pick an answer.
As previously mentioned, the exam starts with simulations. If you are finding a question tricky, go to the top right-hand corner and there will be a button saying something like Flag for review, but do NOT attempt to answer that particular question. Do this with any question you find difficult, no matter how large or small it is. When you have finished the final question, you will automatically be taken to the review screen. Don't waste time working...