Your exam will have a number of tasks, some of these may be sub-divided into a number of different questions. At the end of each question, it will tell you how many marks are allocated for each question, usually the maximum number of marks available will be 25 but it may be as little as 2.
As a rule of thumb, when you answer each question check the point allocation first, for a question allocated 20 marks, you will need to aim for at least 20 different issues. If a question worth just five marks aim for at least 5 issues etc.  1 mark can be awarded for each piece of technical information provided.