There are ways of doing this and the following can be successfully used by anyone studying for any examinations because exams usually have certain key common elements.
Check Out The Syllabus As an examinee, you have to abide by certain rules and constraints. The time length of the exam, how many question you have to answer, and so forth.
But the examiners also have to abide by certain rules – and they cannot change them (at least not without adequate notice) any more than you can! They have to publish a syllabus for every examination and they can only ask questions on what is contained within that syllabus. Once you know the syllabus, you know where the starting and finishing lines are and how far you have to run
Moreover, all parts of the syllabus are not equal: some parts of it are more equal than others. Some topics will hardly ever be questioned while others will come up every year. Highlight the syllabus using two colours: red, say, for those areas that come up very frequently; green for those which rarely come up. Do this only after a systematic inspection of past exam papers, as the next section will explain.
Then use a third colour to highlight those (hopefully very few) parts of the syllabus which you have really serious difficulty with. Providing these parts are not numerous, and depending on how often they come up, it may be possible to leave them on one side. But do use sense and judgement in doing this!
Whatever You Are Studying, First Study The Exam Papers Studying past examination papers is almost as crucial as studying the subject you have chosen!
Get hold of as many past papers as you can. The more you have the better you will be able to discern any patterns. Draw up a grid on A4 paper. Divide the top horizontally into years – as many as you have past papers for plus one for the year in which you are going to sit the exam Divide the lefthand vertical into as many subject areas as seems appropriate from your inspection of the syllabus and past exam papers. Do this very careful and only after you have become very familiar with the exam topics. Also, make allowance for any coupling of topics because sometimes examiners like to link one topic with another. If you have, say, a dozen past papers and a particular linking has only come up once, you are probably save to forget it. But if it has occurred, say, three or four times it needs to go down.
So now you have large set of cells, each of which relates to a particular year and to a specific topic. Place a cross in each cell for the year in which a given topic has come up. If there is a pattern, and very often there is, you will soon see it. The relative frequency with which the various topic come up will now be easy to see.
It is not that examiners are doing a parallel kind of exercise to determine the structure of the next examination they set. They might well be unaware of the kinds of patterns we are talking about. But examiners do have at least a mental scheduling of the relative importance of particular topics and an impression of what have been chosen recently.
Now use the spare column on the right-hand side, which relates to the year you are going to sit the exam, to mark those subject areas which seem most likely to come up this next time. These are the ones which you need to spend extra time on. The other areas need to be covered as well, but your projections need special care and attention.