The examination questions cover all of the syllabus. During studies the whole of the syllabus content should be covered. Do not on the one hand imagine that it is so easy that one can hardly fail, or on the other hand feel that the questions are bound to be beyond one's capabilities. Candidates are not competing against others but are trying to reach a certain standard.
If a question is found to be too difficult, leave it and pass on to the next. One can return to it later and make an intelligent guess. The computer will only record the correct answer. It cannot be fooled by filling in all the spaces provided for the answer!
Relax. If you have learned the material in the syllabus, then you will pass. If you have not, then you may still pass or you will pass next time. When you take your seat, it is too late to worry about it. There are probably as many failures due to nerves as to gaps in candidates knowledge. Even if your mind goes completely blank over a question, a blind guess has a one in four chance of being right. Usually one possible answer is completely ridiculous, so one can easily raise the chances to one in three. Remember, no one expects to get every question right, the pass mark is usually around forty percent.
Don't overdo the revision, especially in the days before the exam. The tired brain is much less capable than the rested one. The evening before the exam is best spent relaxing and putting it out of one's mind.
Provided the required standard is reached a pass will be obtained. A great many candidates of all ages and from all walks of life are successful in passing this examination. Good luck!